[jira] [Created] (FLINK-18608) CustomizedConvertRule#convertCast drops nullability

[Shang Yuanchun (Jira)]

Flavio Pompermaier created FLINK-18608:
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             Summary: CustomizedConvertRule#convertCast drops nullability
                 Key: FLINK-18608
                 URL: https://issues.apache.org/jira/browse/FLINK-18608
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
    Affects Versions: 1.11.0
            Reporter: Flavio Pompermaier


The following program shows that nullability is not respected during the tranlastion:


{code:java}
 final TableEnvironment tableEnv = DatalinksExecutionEnvironment.getBatchTableEnv();
    final Table inputTable = tableEnv.fromValues(//
        DataTypes.ROW(//
            DataTypes.FIELD("col1", DataTypes.STRING()), //
            DataTypes.FIELD("col2", DataTypes.STRING())//
        ), //
        Row.of(1L, "Hello"), //
        Row.of(2L, "Hello"), //
        Row.of(3L, ""), //
        Row.of(4L, "Ciao"));
    tableEnv.createTemporaryView("ParquetDataset", inputTable);
    tableEnv.executeSql(//
        "CREATE TABLE `out` (\n" + //
            "col1 STRING,\n" + //
            "col2 STRING\n" + //
            ") WITH (\n" + //
            " 'connector' = 'filesystem',\n" + //
            // " 'format' = 'parquet',\n" + //
            " 'update-mode' = 'append',\n" + //
            " 'path' = 'file://" + TEST_FOLDER + "',\n" + //
            " 'sink.shuffle-by-partition.enable' = 'true'\n" + //
            ")");

    tableEnv.executeSql("INSERT INTO `out` SELECT * FROM ParquetDataset");
{code}


---------------------------------

Exception in thread "main" java.lang.AssertionError: Conversion to relational algebra failed to preserve datatypes:
validated type:
RecordType(VARCHAR(2147483647) CHARACTER SET "UTF-16LE" col1, VARCHAR(2147483647) CHARACTER SET "UTF-16LE" col2) NOT NULL
converted type:
RecordType(VARCHAR(2147483647) CHARACTER SET "UTF-16LE" NOT NULL col1, VARCHAR(2147483647) CHARACTER SET "UTF-16LE" NOT NULL col2) NOT NULL
rel:
LogicalProject(col1=[$0], col2=[$1])
  LogicalUnion(all=[true])
    LogicalProject(col1=[_UTF-16LE'1':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"], col2=[_UTF-16LE'Hello':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"])
      LogicalValues(tuples=[[{ 0 }]])
    LogicalProject(col1=[_UTF-16LE'2':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"], col2=[_UTF-16LE'Hello':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"])
      LogicalValues(tuples=[[{ 0 }]])
    LogicalProject(col1=[_UTF-16LE'3':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"], col2=[_UTF-16LE'':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"])
      LogicalValues(tuples=[[{ 0 }]])
    LogicalProject(col1=[_UTF-16LE'4':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"], col2=[_UTF-16LE'Ciao':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"])
      LogicalValues(tuples=[[{ 0 }]])

at org.apache.calcite.sql2rel.SqlToRelConverter.checkConvertedType(SqlToRelConverter.java:465)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertQuery(SqlToRelConverter.java:580)
at org.apache.flink.table.planner.calcite.FlinkPlannerImpl.org$apache$flink$table$planner$calcite$FlinkPlannerImpl$$rel(FlinkPlannerImpl.scala:164)
at org.apache.flink.table.planner.calcite.FlinkPlannerImpl.rel(FlinkPlannerImpl.scala:151)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.toQueryOperation(SqlToOperationConverter.java:773)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.convertSqlQuery(SqlToOperationConverter.java:745)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:238)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.convertSqlInsert(SqlToOperationConverter.java:527)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:204)
at org.apache.flink.table.planner.delegation.ParserImpl.parse(ParserImpl.java:78)
at org.apache.flink.table.api.internal.TableEnvironmentImpl.executeSql(TableEnvironmentImpl.java:678)



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