[CALCITE-6518] ClassCastException during validation when loading multiple libraries

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.37.0
• Fix Version/s: 1.38.0
• Component/s: core
• Labels: pull-request-available
• Assignee: Unassigned
• Reporter: Mihai Budiu
• Created: 06/Aug/24 17:40
• Updated: 17/Oct/24 22:41
• Resolved: 17/Oct/24 22:41

Description

The following test added to CalciteSqlOperatorTest will cause a ClassCastException:

  @Test void testLibraries() {
    SqlOperatorFixture sqlOperatorFixture = fixture();
    final SqlOperatorFixture f = sqlOperatorFixture.withOperatorTable(
            SqlLibraryOperatorTableFactory.INSTANCE
                .getOperatorTable(
                    SqlLibrary.STANDARD,
                    SqlLibrary.MYSQL,
                    SqlLibrary.POSTGRESQL
                ));
    f.checkScalar("substr('a', 1, 2)", "a", "VARCHAR(1) NOT NULL");
  }

Here is the top of the stack trace:

class org.apache.calcite.sql.type.FamilyOperandTypeChecker cannot be cast to class org.apache.calcite.sql.type.SqlOperandMetadata (org.apache.calcite.sql.type.FamilyOperandTypeChecker and org.apache.calcite.sql.type.SqlOperandMetadata are in unnamed module of loader 'app')
java.lang.ClassCastException: class org.apache.calcite.sql.type.FamilyOperandTypeChecker cannot be cast to class org.apache.calcite.sql.type.SqlOperandMetadata (org.apache.calcite.sql.type.FamilyOperandTypeChecker and org.apache.calcite.sql.type.SqlOperandMetadata are in unnamed module of loader 'app')
	at org.apache.calcite.sql.validate.implicit.TypeCoercionImpl.userDefinedFunctionCoercion(TypeCoercionImpl.java:601)
	at org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:313)
	at org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:231)
	at org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:6789)
	at org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:6776)
	at org.apache.calcite.sql.SqlCall.accept(SqlCall.java:167)
	at org.apache.calcite.sql.validate.SqlValidatorImpl.deriveTypeImpl(SqlValidatorImpl.java:2006)
	at org.apache.calcite.sql.validate.SqlValidatorImpl.deriveType(SqlValidatorImpl.java:1993)
	at org.apache.calcite.sql.SqlNode.validateExpr(SqlNode.java:276)
	at org.apache.calcite.sql.SqlOperator.validateCall(SqlOperator.java:474)
	at org.apache.calcite.sql.validate.SqlValidatorImpl.validateCall(SqlValidatorImpl.java:6446)
	at org.apache.calcite.sql.SqlCall.validate(SqlCall.java:144)
	at org.apache.calcite.sql.SqlNode.validateExpr(SqlNode.java:275)
	at org.apache.calcite.sql.SqlOperator.validateCall(SqlOperator.java:474)
	at org.apache.calcite.sql.validate.SqlValidatorImpl.validateCall(SqlValidatorImpl.java:6446)
	at org.apache.calcite.sql.SqlCall.validate(SqlCall.java:144)
	at org.apache.calcite.sql.validate.SqlValidatorImpl.validateScopedExpression(SqlValidatorImpl.java:1143)
	at org.apache.calcite.sql.validate.SqlValidatorImpl.validate(SqlValidatorImpl.java:849)
	at org.apache.calcite.sql.test.AbstractSqlTester.parseAndValidate(AbstractSqlTester.java:162)
	at org.apache.calcite.sql.test.AbstractSqlTester.validateAndThen(AbstractSqlTester.java:250)

Calcite behaves correctly if either the MYSQL or the POSTGRES libraries are not supplied.

Issue Links

• links to: GitHub Pull Request #3905