allan.hou created FLINK-20884:
---------------------------------

             Summary: NullPointerException in create statements with computed 
columns which the subQuery is SqlNodeList 
                 Key: FLINK-20884
                 URL: https://issues.apache.org/jira/browse/FLINK-20884
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
    Affects Versions: 1.12.0
            Reporter: allan.hou


Create statement:
{code:java}
CREATE TABLE hive.flink_hive.my_kafka_student (
id INT,
name VARCHAR,
score INT,
test as case when score in (1,2,3) then 1 else 0 end
) WITH (
'connector' = 'kafka',
...
);
{code}
Then drop the table or run the application.It always fails with
{code:java}
Caused by: java.lang.NullPointerException
        at java.util.Objects.requireNonNull(Objects.java:203) ~[?:1.8.0_262]
        at 
org.apache.calcite.sql2rel.SqlToRelConverter$Blackboard.convertExpression(SqlToRelConverter.java:4914)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.StandardConvertletTable.convertExpressionList(StandardConvertletTable.java:839)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.StandardConvertletTable.convertCall(StandardConvertletTable.java:815)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.StandardConvertletTable.convertCall(StandardConvertletTable.java:802)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
~[?:1.8.0_262]
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
~[?:1.8.0_262]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[?:1.8.0_262]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_262]
        at 
org.apache.calcite.sql2rel.ReflectiveConvertletTable.lambda$registerNodeTypeMethod$0(ReflectiveConvertletTable.java:83)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.SqlNodeToRexConverterImpl.convertCall(SqlNodeToRexConverterImpl.java:62)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.SqlToRelConverter$Blackboard.visit(SqlToRelConverter.java:5098)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.SqlToRelConverter$Blackboard.visit(SqlToRelConverter.java:4374)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at org.apache.calcite.sql.SqlCall.accept(SqlCall.java:139) 
~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.SqlToRelConverter$Blackboard.convertExpression(SqlToRelConverter.java:4961)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.StandardConvertletTable.convertCase(StandardConvertletTable.java:387)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
~[?:1.8.0_262]
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
~[?:1.8.0_262]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[?:1.8.0_262]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_262]
        at 
org.apache.calcite.sql2rel.ReflectiveConvertletTable.lambda$registerNodeTypeMethod$0(ReflectiveConvertletTable.java:83)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.SqlNodeToRexConverterImpl.convertCall(SqlNodeToRexConverterImpl.java:62)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.SqlToRelConverter$Blackboard.visit(SqlToRelConverter.java:5098)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.SqlToRelConverter$Blackboard.visit(SqlToRelConverter.java:4374)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at org.apache.calcite.sql.SqlCall.accept(SqlCall.java:139) 
~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.SqlToRelConverter$Blackboard.convertExpression(SqlToRelConverter.java:4961)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.calcite.sql2rel.SqlToRelConverter.convertExpression(SqlToRelConverter.java:1925)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.planner.calcite.FlinkPlannerImpl.rex(FlinkPlannerImpl.scala:206)
 ~[flink-table-blink_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.planner.calcite.FlinkPlannerImpl.rex(FlinkPlannerImpl.scala:180)
 ~[flink-table-blink_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.planner.calcite.SqlExprToRexConverterImpl.lambda$convertToRexNodes$1(SqlExprToRexConverterImpl.java:68)
 ~[flink-table-blink_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) 
~[?:1.8.0_262]
        at 
java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) 
~[?:1.8.0_262]
        at 
java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) 
~[?:1.8.0_262]
        at 
java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) 
~[?:1.8.0_262]
        at 
java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) 
~[?:1.8.0_262]
        at 
java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:546) 
~[?:1.8.0_262]
        at 
java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
 ~[?:1.8.0_262]
        at 
java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:505) 
~[?:1.8.0_262]
        at 
org.apache.flink.table.planner.calcite.SqlExprToRexConverterImpl.convertToRexNodes(SqlExprToRexConverterImpl.java:69)
 ~[flink-table-blink_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.planner.calcite.SqlExprToRexConverterImpl.convertToRexNode(SqlExprToRexConverterImpl.java:60)
 ~[flink-table-blink_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.planner.delegation.ParserImpl.parseSqlExpression(ParserImpl.java:93)
 ~[flink-table-blink_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.api.internal.CatalogTableSchemaResolver.resolveExpressionDataType(CatalogTableSchemaResolver.java:137)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.api.internal.CatalogTableSchemaResolver.resolve(CatalogTableSchemaResolver.java:87)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.catalog.CatalogManager.resolveTableSchema(CatalogManager.java:380)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.catalog.CatalogManager.getPermanentTable(CatalogManager.java:408)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.catalog.CatalogManager.dropTableInternal(CatalogManager.java:760)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.catalog.CatalogManager.dropTable(CatalogManager.java:725)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.api.internal.TableEnvironmentImpl.executeOperation(TableEnvironmentImpl.java:781)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.api.internal.TableEnvironmentImpl.executeSql(TableEnvironmentImpl.java:665)
 ~[flink-table_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.client.gateway.local.LocalExecutor.lambda$executeSql$1(LocalExecutor.java:309)
 ~[flink-sql-client_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.client.gateway.local.ExecutionContext.wrapClassLoader(ExecutionContext.java:257)
 ~[flink-sql-client_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.table.client.gateway.local.LocalExecutor.executeSql(LocalExecutor.java:309)
 ~[flink-sql-client_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
{code}
 
It's fine in 1.11.0.  The 1.12 planner calls anthor calcite api to convert 
SqlNode to RexNode. 
 



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