oleg-vlsk commented on code in PR #13583:
URL: https://github.com/apache/ignite/pull/13583#discussion_r4180711387


##########
modules/indexing/src/test/java/org/apache/ignite/internal/processors/cache/CacheConfigurationQueryEntityMergeTest.java:
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@@ -0,0 +1,1260 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.processors.cache;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import javax.cache.CacheException;
+import org.apache.ignite.cache.QueryEntity;
+import org.apache.ignite.cache.QueryIndex;
+import org.apache.ignite.cache.QueryIndexType;
+import org.apache.ignite.cache.query.SqlFieldsQuery;
+import org.apache.ignite.cache.query.annotations.QuerySqlField;
+import org.apache.ignite.configuration.CacheConfiguration;
+import org.apache.ignite.configuration.IgniteConfiguration;
+import org.apache.ignite.internal.IgniteEx;
+import org.apache.ignite.internal.processors.query.QueryEntityEx;
+import org.apache.ignite.internal.processors.query.QueryUtils;
+import org.apache.ignite.spi.systemview.view.SystemView;
+import org.apache.ignite.spi.systemview.view.sql.SqlIndexView;
+import org.apache.ignite.spi.systemview.view.sql.SqlTableColumnView;
+import org.apache.ignite.spi.systemview.view.sql.SqlTableView;
+import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
+import org.junit.Test;
+
+import static org.apache.ignite.cluster.ClusterState.ACTIVE;
+import static 
org.apache.ignite.internal.processors.query.QueryEntityMerger.CONFLICT_MESSAGE_TEMPLATE;
+import static 
org.apache.ignite.internal.processors.query.schema.management.SchemaManager.SQL_TBLS_VIEW;
+import static 
org.apache.ignite.internal.processors.query.schema.management.SchemaManager.SQL_TBL_COLS_VIEW;
+import static org.apache.ignite.testframework.GridTestUtils.assertThrows;
+
+/** Tests for merging QueryEntity metadata in CacheConfiguration. */
+@SuppressWarnings("ThrowableNotThrown")
+public class CacheConfigurationQueryEntityMergeTest extends 
GridCommonAbstractTest {
+    /** */
+    private static final String CACHE_NAME = "query-entity-merge-cache";
+
+    /** */
+    private static final String COMPOSITE_IDX = "PERSON_NAME_AGE_IDX";
+
+    /** */
+    private static final String NAME_IDX = "EXPLICIT_NAME_IDX";
+
+    /** */
+    private static final String AGE_IDX = "EXPLICIT_AGE_IDX";
+
+    /** */
+    private static final String NAME_FIELD = "name";
+
+    /** */
+    private static final String AGE_FIELD = "age";
+
+    /** */
+    private boolean staticCfg;
+
+    /** {@inheritDoc} */
+    @Override protected IgniteConfiguration getConfiguration(String 
igniteInstanceName) throws Exception {
+        IgniteConfiguration cfg = super.getConfiguration(igniteInstanceName);
+
+        if (staticCfg)
+            cfg.setCacheConfiguration(new CacheConfiguration<>(CACHE_NAME));
+
+        return cfg;
+    }
+
+    /** {@inheritDoc} */
+    @Override protected void afterTest() throws Exception {
+        stopAllGrids();
+
+        super.afterTest();
+    }
+
+    /**
+     * Query entities with the same key type but different value types are 
treated as different entities, are not
+     * viewed as a conflict and are not merged into one entity.
+     */
+    @Test
+    public void 
testQueryEntitiesWithSameKeyTypeAndDifferentValueTypesAreNotMerged() throws 
Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Object> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        QueryEntity first = new QueryEntity()
+            .setKeyType(Integer.class.getName())
+            .setValueType(Person.class.getName())
+            .setFields(fields(NAME_FIELD, String.class));
+
+        QueryEntity second = new QueryEntity()
+            .setKeyType(Integer.class.getName())
+            .setValueType(AnnotatedPerson.class.getName())
+            .setFields(fields(NAME_FIELD, String.class));
+
+        ccfg.setQueryEntities(Collections.singleton(first));
+        ccfg.setQueryEntities(Collections.singleton(second));
+
+        node.createCache(ccfg);
+
+        Collection<QueryEntity> entities = entities(node);
+
+        assertEquals(2, entities.size());
+
+        for (Class<?> cls : List.of(Person.class, AnnotatedPerson.class))
+            assertTrue(entities.stream().anyMatch(e -> 
cls.getName().equals(e.getValueType())));
+    }
+
+    /**
+     * Verifies that query entities with the same value type but conflicting 
key types fail to merge instead of silently
+     * ignoring one of the entities.
+     */
+    @Test
+    public void testConflictingKeyTypesForSameValueTypeFail() {
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        QueryEntity first = new QueryEntity()
+            .setKeyType(Integer.class.getName())
+            .setValueType(Person.class.getName())
+            .setFields(fields(NAME_FIELD, String.class));
+
+        QueryEntity second = new QueryEntity()
+            .setKeyType(String.class.getName())
+            .setValueType(Person.class.getName())
+            .setFields(fields(NAME_FIELD, String.class));
+
+        ccfg.setQueryEntities(Collections.singleton(first));
+
+        String msg = String.format(CONFLICT_MESSAGE_TEMPLATE,
+            CACHE_NAME, "keyType", Integer.class.getName(), 
String.class.getName());
+
+        assertThrows(
+            log,
+            () -> ccfg.setQueryEntities(Collections.singleton(second)),
+            CacheException.class,
+            msg
+        );
+    }
+
+    /**
+     * Checks that query entities with conflicting effective key types cannot 
be merged.
+     * <p>
+     * The first entity does not define {@code keyType} explicitly. Instead, 
its effective key type is derived from
+     * {@code keyFieldName} and the corresponding field type. The second 
entity defines a different key type explicitly.
+     * <p>
+     * Although {@link QueryEntity#getKeyType()} returns {@code null} for the 
first entity,
+     * {@link QueryEntity#findKeyType()} resolves its key type from the field 
metadata. Therefore, the entities must be
+     * treated as having conflicting key types.
+     */
+    @Test
+    public void testConflictingImplicitAndExplicitKeyTypes() {
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        QueryEntity first = new QueryEntity()
+            .setValueType(Person.class.getName())
+            .setFields(fields("id", Integer.class))
+            .setKeyFieldName("id"); // keyType is null
+
+        QueryEntity second = new QueryEntity()
+            .setValueType(Person.class.getName())
+            .setKeyType(String.class.getName());
+
+        ccfg.setQueryEntities(Collections.singleton(first));
+
+        String msg = String.format(CONFLICT_MESSAGE_TEMPLATE,
+            CACHE_NAME, "keyType", Integer.class.getName(), 
String.class.getName());
+
+        assertThrows(
+            log,
+            () -> ccfg.setQueryEntities(Collections.singleton(second)),
+            CacheException.class,
+            msg
+        );
+    }
+
+    /**
+     * Checks that query entities with matching effective value types can be 
merged when one value type is defined
+     * implicitly and the other one explicitly.
+     * <p>
+     * The first entity does not define {@code valueType} explicitly. Its 
effective value type is derived from
+     * {@code valueFieldName} and the corresponding field type, so {@link 
QueryEntity#getValueType()} returns
+     * {@code null}, while {@link QueryEntity#findValueType()} resolves it to 
the person type.
+     * <p>
+     * The second entity defines the same value type explicitly. Since both 
entities have the same effective value
+     * type, they must be merged without a conflict.
+     */
+    @Test
+    public void testMatchingImplicitAndExplicitValueTypesAreMerged() throws 
Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        QueryEntity first = new QueryEntity()
+            .setFields(fields("val", Person.class))
+            .setValueFieldName("val"); // valueType is null
+
+        QueryEntity second = new 
QueryEntity().setValueType(Person.class.getName());
+
+        ccfg.setQueryEntities(Collections.singleton(first));
+        ccfg.setQueryEntities(Collections.singleton(second));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals("val", entity.getValueFieldName());
+        assertEquals(Person.class.getName(), entity.getFields().get("val"));
+        assertEquals(Person.class.getName(), entity.getValueType());
+    }
+
+    /** A missing table name in the first entity must be filled from the 
second entity. */
+    @Test
+    public void testTableNameIsFilledFromSecondEntity() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String tblName = "PERSON";
+
+        QueryEntity first = personEntity(fields(NAME_FIELD, String.class));
+        first.setTableName(null);
+
+        QueryEntity second = personEntity(fields(AGE_FIELD, Integer.class));
+        second.setTableName(tblName);
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+        ccfg.setQueryEntities(Collections.singletonList(second));
+
+        node.createCache(ccfg);
+
+        SqlTableView tbl = cacheTable(node);
+        assertNotNull(tbl);
+
+        assertEquals(tblName, tbl.tableName());
+    }
+
+    /** Same table names for one query entity are merged. */
+    @Test
+    public void testSameTableNamesAreMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String tblName = "PERSON";
+
+        QueryEntity first = personEntity(fields(NAME_FIELD, String.class));
+        first.setTableName(tblName);
+
+        QueryEntity second = personEntity(fields(AGE_FIELD, Integer.class));
+        second.setTableName(tblName);
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+        ccfg.setQueryEntities(Collections.singletonList(second));
+
+        node.createCache(ccfg);
+
+        SqlTableView tbl = cacheTable(node);
+        assertNotNull(tbl);
+
+        assertEquals(tblName, tbl.tableName());
+    }
+
+    /** Different configured table names are a conflict. */
+    @Test
+    public void testConflictingTableNamesFails() {
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String tableA = "TABLE_A";
+        String tableB = "TABLE_B";
+
+        QueryEntity first = personEntity(fields(NAME_FIELD, String.class));
+        first.setTableName(tableA);
+
+        QueryEntity second = personEntity(fields(AGE_FIELD, Integer.class));
+        second.setTableName(tableB);
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+
+        String msg = String.format(CONFLICT_MESSAGE_TEMPLATE, CACHE_NAME, 
"tableName", tableA, tableB);
+
+        assertThrows(
+            log,
+            () -> ccfg.setQueryEntities(Collections.singletonList(second)),
+            CacheException.class,
+            msg
+        );
+    }
+
+    /** A missing key field name in the first entity must be filled from the 
second entity. */
+    @Test
+    public void testKeyFieldNameIsFilledFromSecondEntity() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String keyFieldName = "key";
+
+        QueryEntity first = personEntity(fields(keyFieldName, Integer.class, 
NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(keyFieldName, Integer.class, 
NAME_FIELD, String.class));
+
+        second.setKeyFieldName(keyFieldName);
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+        ccfg.setQueryEntities(Collections.singletonList(second));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals(keyFieldName, entity.getKeyFieldName());
+    }
+
+    /** Same key field names must be merged. */
+    @Test
+    public void testSameKeyFieldNameIsMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String keyFieldName = "key";
+
+        QueryEntity first = personEntity(fields(keyFieldName, Integer.class, 
NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(keyFieldName, Integer.class, 
NAME_FIELD, String.class));
+
+        first.setKeyFieldName(keyFieldName);
+        second.setKeyFieldName(keyFieldName);
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+        ccfg.setQueryEntities(Collections.singletonList(second));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals(keyFieldName, entity.getKeyFieldName());
+    }
+
+    /** Different key field names for the same query entity are a conflict. */
+    @Test
+    public void testConflictingKeyFieldNamesFail() {
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String key1 = "key1";
+        String key2 = "key2";
+
+        QueryEntity first = personEntity(fields(key1, Integer.class, key2, 
Integer.class, NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(key1, Integer.class, key2, 
Integer.class, NAME_FIELD, String.class));
+
+        first.setKeyFieldName(key1);
+        second.setKeyFieldName(key2);
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+
+        String msg = String.format(CONFLICT_MESSAGE_TEMPLATE, CACHE_NAME, 
"keyFieldName", key1, key2);
+
+        assertThrows(
+            log,
+            () -> ccfg.setQueryEntities(Collections.singletonList(second)),
+            CacheException.class,
+            msg
+        );
+    }
+
+    /** A missing value field name in the first entity must be filled from the 
second entity. */
+    @Test
+    public void testValueFieldNameIsFilledFromSecondEntity() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String valFieldName = "value";
+
+        QueryEntity first = personEntity(fields(valFieldName, Person.class, 
NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(valFieldName, Person.class, 
NAME_FIELD, String.class));
+
+        second.setValueFieldName(valFieldName);
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+        ccfg.setQueryEntities(Collections.singletonList(second));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals(valFieldName, entity.getValueFieldName());
+    }
+
+    /** Same value field names must be merged. */
+    @Test
+    public void testSameValueFieldNameIsMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String valFieldName = "value";
+
+        QueryEntity first = personEntity(fields(valFieldName, Integer.class, 
NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(valFieldName, Integer.class, 
NAME_FIELD, String.class));
+
+        first.setValueFieldName(valFieldName);
+        second.setValueFieldName(valFieldName);
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+        ccfg.setQueryEntities(Collections.singletonList(second));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals(valFieldName, entity.getValueFieldName());
+    }
+
+    /** Different value field names for the same query entity are a conflict. 
*/
+    @Test
+    public void testConflictingValueFieldNamesFail() {
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String val1 = "value1";
+        String val2 = "value2";
+
+        QueryEntity first = personEntity(fields(val1, Person.class, val2, 
Person.class, NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(val1, Person.class, val2, 
Person.class, NAME_FIELD, String.class));
+
+        first.setValueFieldName(val1);
+        second.setValueFieldName(val2);
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+
+        String msg = String.format(CONFLICT_MESSAGE_TEMPLATE, CACHE_NAME, 
"valueFieldName", val1, val2);
+
+        assertThrows(
+            log,
+            () -> ccfg.setQueryEntities(Collections.singletonList(second)),
+            CacheException.class,
+            msg
+        );
+    }
+
+    /** Same field with the same type must be merged. */
+    @Test
+    public void testSameFieldWithSameTypeIsMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        
ccfg.setQueryEntities(Collections.singletonList(personEntity(fields(NAME_FIELD, 
String.class))));
+        
ccfg.setQueryEntities(Collections.singletonList(personEntity(fields(NAME_FIELD, 
String.class))));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals(
+            Map.of(NAME_FIELD, String.class.getName()),
+            entity.getFields()
+        );
+    }
+
+    /** Same field with different types is a conflict. */
+    @Test
+    public void testSameFieldWithDifferentTypesFails() {
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        QueryEntity first = personEntity(fields(NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(NAME_FIELD, Integer.class));
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+
+        String msg = String.format(CONFLICT_MESSAGE_TEMPLATE,
+            CACHE_NAME, "fieldType[" + NAME_FIELD + ']', 
String.class.getName(), Integer.class.getName());
+
+        assertThrows(
+            log,
+            () -> ccfg.setQueryEntities(Collections.singletonList(second)),
+            CacheException.class,
+            msg
+        );
+    }
+
+    /** Different key fields for the same entity must be merged. */
+    @Test
+    public void testDifferentKeyFieldsAreMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Object, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String key1 = "id";
+        String key2 = "otherId";
+
+        QueryEntity first = personEntity(fields(key1, Integer.class, 
NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(key2, Integer.class, 
NAME_FIELD, String.class));
+
+        first.setKeyFields(Collections.singleton(key1));
+        second.setKeyFields(Collections.singleton(key2));
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+        ccfg.setQueryEntities(Collections.singletonList(second));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals(new LinkedHashSet<>(Arrays.asList(key1, key2)), 
entity.getKeyFields());
+    }
+
+    /** Same key fields for the same entity must be merged. */
+    @Test
+    public void testSameKeyFieldsAreMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Object, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String key = "id";
+
+        QueryEntity first = personEntity(fields(key, Integer.class, 
NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(key, Integer.class, 
NAME_FIELD, String.class));
+
+        first.setKeyFields(Collections.singleton(key));
+        second.setKeyFields(Collections.singleton(key));
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+        ccfg.setQueryEntities(Collections.singletonList(second));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals(Collections.singleton("id"), entity.getKeyFields());
+    }
+
+    /** NOT NULL fields from annotation and explicit configuration must be 
merged. */
+    @Test
+    public void testNotNullFieldsAreMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, AnnotatedPerson> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        ccfg.setIndexedTypes(Integer.class, AnnotatedPerson.class);
+
+        ccfg.setQueryEntities(Collections.singletonList(
+            configuredEntity(AnnotatedPerson.class)
+                .setNotNullFields(Collections.singleton(AGE_FIELD))
+        ));
+
+        node.createCache(ccfg);
+
+        List<SqlTableColumnView> cols = cacheColumns(node);
+
+        SqlTableColumnView nameCol = findColumn(cols, NAME_FIELD);
+        SqlTableColumnView ageCol = findColumn(cols, AGE_FIELD);
+
+        assertNotNull(nameCol);
+        assertNotNull(ageCol);
+
+        assertFalse(nameCol.nullable());
+        assertFalse(ageCol.nullable());
+    }
+
+    /** Same NOT NULL fields from annotation and explicit configuration must 
be merged. */
+    @Test
+    public void testSameNotNullFieldsAreMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, AnnotatedPerson> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        ccfg.setIndexedTypes(Integer.class, AnnotatedPerson.class);
+
+        ccfg.setQueryEntities(Collections.singletonList(
+            configuredEntity(AnnotatedPerson.class)
+                .setNotNullFields(Collections.singleton(NAME_FIELD))
+        ));
+
+        node.createCache(ccfg);
+
+        List<SqlTableColumnView> cols = cacheColumns(node);
+
+        SqlTableColumnView nameCol = findColumn(cols, NAME_FIELD);
+        assertNotNull(nameCol);
+
+        assertFalse(nameCol.nullable());
+    }
+
+    /** Aliases for different entity fields must be merged. */
+    @Test
+    public void testAliasesForDifferentFieldsAreMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String nameAlias = "name-alias";
+        String ageAlias = "age-alias";
+
+        QueryEntity first = personEntity(fields(NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(AGE_FIELD, Integer.class));
+
+        first.setAliases(Collections.singletonMap(NAME_FIELD, nameAlias));
+        second.setAliases(Collections.singletonMap(AGE_FIELD, ageAlias));
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+        ccfg.setQueryEntities(Collections.singletonList(second));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals(2, entity.getAliases().size());
+
+        String actualNameAlias = entity.getAliases().get(NAME_FIELD);
+
+        assertNotNull(actualNameAlias);
+        assertTrue(nameAlias.equalsIgnoreCase(actualNameAlias));
+
+        String actualAgeAlias = entity.getAliases().get(AGE_FIELD);
+
+        assertNotNull(actualAgeAlias);
+        assertTrue(ageAlias.equalsIgnoreCase(actualAgeAlias));
+    }
+
+    /** Different aliases for the same field are a conflict. */
+    @Test
+    public void testDifferentAliasesForSameFieldFail() {
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String alias1 = "alias1";
+        String alias2 = "alias2";
+
+        QueryEntity first = personEntity(fields(NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(NAME_FIELD, String.class));
+
+        first.setAliases(Collections.singletonMap(NAME_FIELD, alias1));
+        second.setAliases(Collections.singletonMap(NAME_FIELD, alias2));
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+
+        String msg = String.format(CONFLICT_MESSAGE_TEMPLATE, CACHE_NAME, 
"aliases[" + NAME_FIELD + ']', alias1, alias2);
+
+        assertThrows(
+            log,
+            () -> ccfg.setQueryEntities(Collections.singletonList(second)),
+            CacheException.class,
+            msg
+        );
+    }
+
+    /** Default field values for different fields must be merged. */
+    @Test
+    public void testDefaultFieldValuesAreMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String defName = "John Doe";
+        int defAge = 30;
+
+        QueryEntity first = personEntity(fields(NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(AGE_FIELD, Integer.class));
+
+        first.setDefaultFieldValues(Collections.singletonMap(NAME_FIELD, 
defName));
+        second.setDefaultFieldValues(Collections.singletonMap(AGE_FIELD, 
defAge));
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+        ccfg.setQueryEntities(Collections.singletonList(second));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals(2, entity.getDefaultFieldValues().size());
+
+        String actualDefName = 
(String)entity.getDefaultFieldValues().get(NAME_FIELD);
+        assertNotNull(actualDefName);
+
+        assertEquals(defName, actualDefName);
+
+        int actualDefAge = (int)entity.getDefaultFieldValues().get(AGE_FIELD);
+
+        assertEquals(defAge, actualDefAge);
+    }
+
+    /** Different aliases for the same field are a conflict. */
+    @Test
+    public void testDifferentDefaultValuesForSameFieldFail() {
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String defName1 = "NAME_A";
+        String defName2 = "NAME_B";
+
+        QueryEntity first = personEntity(fields(NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(NAME_FIELD, String.class));
+
+        first.setDefaultFieldValues(Collections.singletonMap(NAME_FIELD, 
defName1));
+        second.setDefaultFieldValues(Collections.singletonMap(NAME_FIELD, 
defName2));
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+
+        String msg = String.format(CONFLICT_MESSAGE_TEMPLATE,
+            CACHE_NAME, "defaultFieldValues[" + NAME_FIELD + ']', defName1, 
defName2);
+
+        assertThrows(
+            log,
+            () -> ccfg.setQueryEntities(Collections.singletonList(second)),
+            CacheException.class,
+            msg
+        );
+    }
+
+    /** A missing precision definition in the first entity must be filled from 
the second entity. */
+    @Test
+    public void testPrecisionIsMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        int precision = 50;
+
+        QueryEntity first = personEntity(fields(NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(NAME_FIELD, String.class));
+
+        second.setFieldsPrecision(Collections.singletonMap(NAME_FIELD, 
precision));
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+        ccfg.setQueryEntities(Collections.singletonList(second));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals(
+            Map.of(NAME_FIELD, precision),
+            entity.getFieldsPrecision()
+        );
+    }
+
+    /** Equal precision definitions are merged. */
+    @Test
+    public void testSamePrecisionIsMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        int precision = 50;
+
+        QueryEntity first = personEntity(fields(NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(NAME_FIELD, String.class));
+
+        first.setFieldsPrecision(Collections.singletonMap(NAME_FIELD, 
precision));
+        second.setFieldsPrecision(Collections.singletonMap(NAME_FIELD, 
precision));
+
+        ccfg.setQueryEntities(Collections.singleton(first));
+        ccfg.setQueryEntities(Collections.singleton(second));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        assertEquals(
+            Map.of(NAME_FIELD, precision),
+            entity.getFieldsPrecision()
+        );
+    }
+
+    /** Different precision definitions for the same field are a conflict. */
+    @Test
+    public void testDifferentPrecisionDefinitionsFail() {
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        int precision1 = 50;
+        int precision2 = 100;
+
+        QueryEntity first = personEntity(fields(NAME_FIELD, String.class));
+        QueryEntity second = personEntity(fields(NAME_FIELD, String.class));
+
+        first.setFieldsPrecision(Collections.singletonMap(NAME_FIELD, 
precision1));
+        second.setFieldsPrecision(Collections.singletonMap(NAME_FIELD, 
precision2));
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+
+        String msg = String.format(CONFLICT_MESSAGE_TEMPLATE,
+            CACHE_NAME, "fieldsPrecision[" + NAME_FIELD + ']', precision1, 
precision2);
+
+        assertThrows(
+            log,
+            () -> ccfg.setQueryEntities(Collections.singletonList(second)),
+            CacheException.class,
+            msg
+        );
+    }
+
+    /** Scale definitions for different entity fields are merged. */
+    @Test
+    public void testScaleDefinitionsForDifferentFieldsAreMerged() throws 
Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, AnnotatedPerson> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        ccfg.setIndexedTypes(Integer.class, AnnotatedPerson.class);
+
+        ccfg.setQueryEntities(Collections.singletonList(
+            configuredEntity(AnnotatedPerson.class)
+                .setFieldsScale(Collections.singletonMap("weight", 2))
+        ));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+        assertNotNull(entity);
+
+        int weightScale = entity.getFieldsScale().get("weight");
+        assertEquals(2, weightScale);
+
+        int heightScale = entity.getFieldsScale().get("height");
+        assertEquals(2, heightScale);
+    }
+
+    /** Different scale definitions for the same entity field are a conflict. 
*/
+    @Test
+    public void testConflictingScaleDefinitionsFail() {
+        CacheConfiguration<Integer, AnnotatedPerson> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        ccfg.setIndexedTypes(Integer.class, AnnotatedPerson.class);
+
+        String heightField = "height";
+        int heightScale = 3;
+
+        QueryEntity configured = configuredEntity(AnnotatedPerson.class)
+            .setFieldsScale(Collections.singletonMap(heightField, 
heightScale));
+
+        String msg = String.format(CONFLICT_MESSAGE_TEMPLATE,
+            CACHE_NAME, "fieldsScale[" + heightField + ']', 2, heightScale);
+
+        assertThrows(
+            log,
+            () -> ccfg.setQueryEntities(Collections.singletonList(configured)),
+            CacheException.class,
+            msg
+        );
+    }
+
+    /** Configured indexedTypes must not prevent configured composite index 
from being created. */
+    @Test
+    public void testCompositeIndexIsCreatedWithIndexedTypes() throws Exception 
{
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<Integer, Person>(CACHE_NAME)
+            .setIndexedTypes(Integer.class, Person.class)
+            .setQueryEntities(Collections.singletonList(
+                configuredEntity(Person.class, index(COMPOSITE_IDX, 
NAME_FIELD, AGE_FIELD))
+            ));
+
+        node.createCache(ccfg);
+
+        List<SqlIndexView> indexes = cacheIndexes(node);
+
+        assertTrue(hasIndex(indexes, COMPOSITE_IDX));
+
+        assertEquals(1, indexes.stream().filter(idx -> !idx.isPk()).count());
+    }
+
+    /** Annotation index and configured composite index must coexist. */
+    @Test
+    public void testAnnotationAndConfiguredIndexesAreCreated() throws 
Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, AnnotatedPerson> ccfg = new 
CacheConfiguration<Integer, AnnotatedPerson>(CACHE_NAME)
+            .setIndexedTypes(Integer.class, AnnotatedPerson.class)
+            .setQueryEntities(Collections.singletonList(
+                configuredEntity(AnnotatedPerson.class, index(COMPOSITE_IDX, 
NAME_FIELD, AGE_FIELD))
+            ));
+
+        node.createCache(ccfg);
+
+        List<SqlIndexView> indexes = cacheIndexes(node);
+
+        String annotationIdxName = annotationIndexName();
+
+        assertTrue(hasIndex(indexes, annotationIdxName));
+        assertTrue(hasIndex(indexes, COMPOSITE_IDX));
+
+        assertEquals(2, indexes.stream().filter(idx -> !idx.isPk()).count());
+    }
+
+    /** Reverse order must work as well: queryEntities first, indexedTypes 
second. */
+    @Test
+    public void testReverseConfigurationOrder() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, AnnotatedPerson> ccfg = new 
CacheConfiguration<Integer, AnnotatedPerson>(CACHE_NAME)
+            .setQueryEntities(Collections.singletonList(
+                configuredEntity(AnnotatedPerson.class, index(COMPOSITE_IDX, 
NAME_FIELD, AGE_FIELD))
+            ))
+            .setIndexedTypes(Integer.class, AnnotatedPerson.class);
+
+        node.createCache(ccfg);
+
+        List<SqlIndexView> indexes = cacheIndexes(node);
+
+        assertTrue(hasIndex(indexes, annotationIndexName()));
+        assertTrue(hasIndex(indexes, COMPOSITE_IDX));
+
+        assertEquals(2, indexes.stream().filter(idx -> !idx.isPk()).count());
+    }
+
+    /** Metadata added by several consecutive setQueryEntities calls must 
accumulate. */
+    @Test
+    public void testSeveralSetQueryEntitiesCreateAllIndexes() throws Exception 
{
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        ccfg.setQueryEntities(Collections.singletonList(
+            configuredEntity(Person.class, index(NAME_IDX, NAME_FIELD))
+        ));
+
+        ccfg.setQueryEntities(Collections.singletonList(
+            configuredEntity(Person.class, index(AGE_IDX, AGE_FIELD))
+        ));
+
+        ccfg.setQueryEntities(Collections.singletonList(
+            configuredEntity(Person.class, index(COMPOSITE_IDX, NAME_FIELD, 
AGE_FIELD))
+        ));
+
+        node.createCache(ccfg);
+
+        List<SqlIndexView> indexes = cacheIndexes(node);
+
+        assertTrue(hasIndex(indexes, NAME_IDX));
+        assertTrue(hasIndex(indexes, AGE_IDX));
+        assertTrue(hasIndex(indexes, COMPOSITE_IDX));
+
+        assertEquals(3, indexes.stream().filter(idx -> !idx.isPk()).count());
+    }
+
+    /** Identical index definitions must be deduplicated. */
+    @Test
+    public void testSameIndexDefinitionIsDeduplicated() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String idxName = "DUP_IDX";
+
+        QueryIndex idx = index(idxName, NAME_FIELD);
+
+        
ccfg.setQueryEntities(Collections.singletonList(personEntity(fields(NAME_FIELD, 
String.class), idx)));
+        
ccfg.setQueryEntities(Collections.singletonList(personEntity(fields(NAME_FIELD, 
String.class), idx)));
+
+        node.createCache(ccfg);
+
+        List<SqlIndexView> indexes = cacheIndexes(node);
+
+        assertTrue(hasIndex(indexes, idxName));
+
+        assertEquals(1, indexes.stream().filter(i -> !i.isPk()).count());
+    }
+
+    /** Same index name with different definition is a conflict. */
+    @Test
+    public void testSameIndexNameWithDifferentDefinitionFails() {
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        String ageField = AGE_FIELD;
+        String conflictIdx = "CONFLICT_IDX";
+
+        QueryEntity first = configuredEntity(Person.class, index(conflictIdx, 
NAME_FIELD));
+        QueryEntity second = configuredEntity(Person.class, index(conflictIdx, 
ageField));
+
+        ccfg.setQueryEntities(Collections.singletonList(first));
+
+        String msg = String.format("Failed to merge query entities due to 
conflicting metadata [" +
+                "cacheName=%s, property=index[%s], " +
+                "existingValue=QueryIndex [name=%s, fields=LinkedHashMap 
{%s=true}, type=SORTED, inlineSize=-1], " +
+                "incomingValue=QueryIndex [name=%s, fields=LinkedHashMap 
{%s=true}, type=SORTED, inlineSize=-1]]",
+            CACHE_NAME, conflictIdx, conflictIdx, NAME_FIELD, conflictIdx, 
ageField);
+
+        assertThrows(
+            log,
+            () -> ccfg.setQueryEntities(Collections.singletonList(second)),
+            CacheException.class,
+            msg
+        );
+    }
+
+    /** Indexes without explicitly configured names are merged correctly. */
+    @Test
+    public void testIndexesWithoutExplicitNamesAreMerged() throws Exception {
+        IgniteEx node = startGrid(0);
+
+        CacheConfiguration<Integer, Person> ccfg = new 
CacheConfiguration<>(CACHE_NAME);
+
+        QueryIndex firstIdx = new 
QueryIndex(Collections.singletonList(NAME_FIELD), QueryIndexType.SORTED);
+        assertNull(firstIdx.getName());
+
+        QueryIndex secondIdx = new QueryIndex(Arrays.asList(NAME_FIELD, 
AGE_FIELD), QueryIndexType.SORTED);
+        assertNull(secondIdx.getName());
+
+        QueryIndex thirdIdx = index(AGE_IDX, AGE_FIELD);
+        assertNotNull(thirdIdx.getName());
+
+        
ccfg.setQueryEntities(Collections.singletonList(configuredEntity(Person.class, 
firstIdx)));
+        
ccfg.setQueryEntities(Collections.singletonList(configuredEntity(Person.class, 
secondIdx)));
+        
ccfg.setQueryEntities(Collections.singletonList(configuredEntity(Person.class, 
thirdIdx)));
+
+        node.createCache(ccfg);
+
+        QueryEntity entity = singleQueryEntity(node);
+
+        assertEquals(3, entity.getIndexes().size());
+
+        for (QueryIndex idx : List.of(firstIdx, secondIdx, thirdIdx))
+            assertTrue(entity.getIndexes().stream().anyMatch(i -> 
i.getFields().equals(idx.getFields())));
+    }
+
+    /**
+     * Verifies that adding SQL metadata to a statically configured cache 
preserves {@link QueryEntityEx} and its
+     * extended metadata.
+     *
+     * <p>A schema-add operation patches both the runtime cache configuration 
and the cache descriptor configuration.
+     * These configurations must not share a mutable query-entity collection, 
otherwise the first patch may modify the
+     * descriptor configuration before the schema-finish phase and cause the 
same query entity to be merged again.</p>
+     */
+    @Test
+    public void testSchemaAddPreservesQueryEntityExMetadata() throws Exception 
{
+        staticCfg = true;
+
+        IgniteEx node = startGrid(0);
+
+        node.cluster().state(ACTIVE);
+
+        DynamicCacheDescriptor desc = 
node.context().cache().cacheDescriptor(CACHE_NAME);
+
+        assertTrue(desc.cacheConfiguration().getQueryEntities().isEmpty());
+
+        node.cache(CACHE_NAME).query(new SqlFieldsQuery(
+            "CREATE TABLE TEST_TBL (" +
+                "ID1 INT, " +
+                "ID2 INT, " +
+                "VAL VARCHAR NOT NULL, " +
+                "PRIMARY KEY (ID1, ID2)" +
+                ") WITH \"CACHE_NAME=" + CACHE_NAME + "\""
+        )).getAll();
+
+        Collection<QueryEntity> entities = node.context().cache()
+            .cacheDescriptor(CACHE_NAME)
+            .cacheConfiguration()
+            .getQueryEntities();

Review Comment:
   Code corrected.



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