Fix rendering of xmltable and boolean handling for older versions of DB2

Author: beikov

hibernate-core/src/main/java/org/hibernate/dialect/function/xml/DB2XmlTableFunction.java

@@ -37,16 +37,18 @@ public DB2XmlTableFunction(TypeConfiguration typeConfiguration) {
 	protected void renderXmlTable(SqlAppender sqlAppender, XmlTableArguments arguments, AnonymousTupleTableGroupProducer tupleType, String tableIdentifierVariable, SqlAstTranslator<?> walker) {
 		sqlAppender.appendSql( "xmltable(" );
 		// DB2 doesn't like parameters for the xpath expression
-		walker.render( arguments.xpath(), SqlAstNodeRenderingMode.INLINE_PARAMETERS );
+		final String xpath = walker.getLiteralValue( arguments.xpath() );
+		sqlAppender.appendSingleQuoteEscapedString( "$d" + xpath );
 		sqlAppender.appendSql( " passing " );
 		if ( !arguments.isXmlType() ) {
 			sqlAppender.appendSql( "xmlparse(document " );
 		}
 		// DB2 needs parameters to be casted here
 		walker.render( arguments.xmlDocument(), SqlAstNodeRenderingMode.NO_PLAIN_PARAMETER );
 		if ( !arguments.isXmlType() ) {
-			sqlAppender.appendSql( ")" );
+			sqlAppender.appendSql( ')' );
 		}
+		sqlAppender.appendSql( " as \"d\"" );
 		renderColumns( sqlAppender, arguments.columnsClause(), walker );
 		sqlAppender.appendSql( ')' );
 	}
@@ -69,7 +71,10 @@ protected void renderXmlValueColumnDefinition(SqlAppender sqlAppender, XmlTableV
 	}
 
 	static boolean isBoolean(JdbcMapping type) {
-		return type.getJdbcType().isBoolean();
+		return switch ( type.getCastType() ) {
+			case BOOLEAN, TF_BOOLEAN, YN_BOOLEAN, INTEGER_BOOLEAN -> true;
+			default -> false;
+		};
 	}
 
 	private static class DB2XmlTableSetReturningFunctionTypeResolver extends XmlTableSetReturningFunctionTypeResolver {

hibernate-core/src/main/java/org/hibernate/dialect/function/xml/HANAXmlTableFunction.java

@@ -417,7 +417,10 @@ protected void renderDefaultExpression(@Nullable Expression expression, SqlAppen
 	}
 
 	static boolean isBoolean(JdbcMapping type) {
-		return type.getJdbcType().isBoolean();
+		return switch ( type.getCastType() ) {
+			case BOOLEAN, TF_BOOLEAN, YN_BOOLEAN, INTEGER_BOOLEAN -> true;
+			default -> false;
+		};
 	}
 
 	private static class DB2XmlTableSetReturningFunctionTypeResolver extends XmlTableSetReturningFunctionTypeResolver {

hibernate-core/src/main/java/org/hibernate/dialect/function/xml/SybaseASEXmlTableFunction.java

@@ -203,6 +203,9 @@ protected void addSelectableMapping(List<SelectableMapping> selectableMappings,
 	}
 
 	public static boolean isBoolean(JdbcMapping type) {
-		return type.getJavaTypeDescriptor().getJavaTypeClass() == Boolean.class;
+		return switch ( type.getCastType() ) {
+			case BOOLEAN, TF_BOOLEAN, YN_BOOLEAN, INTEGER_BOOLEAN -> true;
+			default -> false;
+		};
 	}
 }