Vladsz83 commented on code in PR #11659: URL: https://github.com/apache/ignite/pull/11659#discussion_r1850788759
########## modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/prepare/IgniteSqlCallRewriteTable.java: ########## @@ -0,0 +1,117 @@ +/* + * 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.query.calcite.prepare; + +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.function.BiFunction; +import org.apache.calcite.sql.SqlCall; +import org.apache.calcite.sql.SqlNode; +import org.apache.calcite.sql.SqlNodeList; +import org.apache.calcite.sql.SqlOperator; +import org.apache.calcite.sql.fun.SqlCase; +import org.apache.calcite.sql.fun.SqlLibraryOperators; +import org.apache.calcite.sql.fun.SqlStdOperatorTable; +import org.apache.calcite.sql.parser.SqlParserPos; +import org.apache.calcite.sql.validate.SqlValidator; + +import static org.apache.calcite.util.Static.RESOURCE; + +/** + * Ignite SQL call rewrite table. Performs unconditional rewrites for some predefined Calcite SQL operators, + * which can't be extended other ways by Ignite. + */ +public class IgniteSqlCallRewriteTable { + /** Instance. */ + public static final IgniteSqlCallRewriteTable INSTANCE = new IgniteSqlCallRewriteTable(); + + /** Registered rewriters map. */ + private final Map<SqlOperator, BiFunction<SqlValidator, SqlCall, SqlCall>> map = new HashMap<>(); + + /** */ + private IgniteSqlCallRewriteTable() { + register(SqlLibraryOperators.NVL, IgniteSqlCallRewriteTable::nvlRewriter); + register(SqlLibraryOperators.DECODE, IgniteSqlCallRewriteTable::decodeRewriter); + } + + /** Registers rewriter for SQL operator. */ + public void register(SqlOperator operator, BiFunction<SqlValidator, SqlCall, SqlCall> rewriter) { + map.put(operator, rewriter); + } + + /** Rewrites SQL call. */ + SqlCall rewrite(SqlValidator validator, SqlCall call) { + BiFunction<SqlValidator, SqlCall, SqlCall> rewriter = map.get(call.getOperator()); + + return rewriter == null ? call : rewriter.apply(validator, call); + } + + /** Rewrites NVL call to CASE WHEN call. */ + public static SqlCall nvlRewriter(SqlValidator validator, SqlCall call) { Review Comment: private? ########## modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/prepare/IgniteSqlCallRewriteTable.java: ########## @@ -0,0 +1,117 @@ +/* + * 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.query.calcite.prepare; + +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.function.BiFunction; +import org.apache.calcite.sql.SqlCall; +import org.apache.calcite.sql.SqlNode; +import org.apache.calcite.sql.SqlNodeList; +import org.apache.calcite.sql.SqlOperator; +import org.apache.calcite.sql.fun.SqlCase; +import org.apache.calcite.sql.fun.SqlLibraryOperators; +import org.apache.calcite.sql.fun.SqlStdOperatorTable; +import org.apache.calcite.sql.parser.SqlParserPos; +import org.apache.calcite.sql.validate.SqlValidator; + +import static org.apache.calcite.util.Static.RESOURCE; + +/** + * Ignite SQL call rewrite table. Performs unconditional rewrites for some predefined Calcite SQL operators, + * which can't be extended other ways by Ignite. + */ +public class IgniteSqlCallRewriteTable { + /** Instance. */ + public static final IgniteSqlCallRewriteTable INSTANCE = new IgniteSqlCallRewriteTable(); + + /** Registered rewriters map. */ + private final Map<SqlOperator, BiFunction<SqlValidator, SqlCall, SqlCall>> map = new HashMap<>(); + + /** */ + private IgniteSqlCallRewriteTable() { + register(SqlLibraryOperators.NVL, IgniteSqlCallRewriteTable::nvlRewriter); + register(SqlLibraryOperators.DECODE, IgniteSqlCallRewriteTable::decodeRewriter); + } + + /** Registers rewriter for SQL operator. */ + public void register(SqlOperator operator, BiFunction<SqlValidator, SqlCall, SqlCall> rewriter) { + map.put(operator, rewriter); + } + + /** Rewrites SQL call. */ + SqlCall rewrite(SqlValidator validator, SqlCall call) { + BiFunction<SqlValidator, SqlCall, SqlCall> rewriter = map.get(call.getOperator()); + + return rewriter == null ? call : rewriter.apply(validator, call); + } + + /** Rewrites NVL call to CASE WHEN call. */ + public static SqlCall nvlRewriter(SqlValidator validator, SqlCall call) { + validateQuantifier(validator, call); // check DISTINCT/ALL + + List<SqlNode> operands = call.getOperandList(); + + if (operands.size() == 2) { + SqlParserPos pos = call.getParserPosition(); + + SqlNodeList whenList = new SqlNodeList(pos); + SqlNodeList thenList = new SqlNodeList(pos); + + whenList.add(SqlStdOperatorTable.IS_NOT_NULL.createCall(pos, operands.get(0))); + thenList.add(SqlNode.clone(operands.get(0))); + SqlNode elseExpr = operands.get(1); + + return SqlCase.createSwitched(pos, null, whenList, thenList, elseExpr); + } + else + return call; // Operands count will be validated and exception will be thrown later. + } + + /** Rewrites DECODE call to CASE WHEN call. */ + public static SqlCall decodeRewriter(SqlValidator validator, SqlCall call) { Review Comment: private? -- This is an automated message from the Apache Git Service. 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