Fixed Calcite processing of queries with APPROX_QUANTILE aggregation.

The removed code seems redundant and it fails with "IllegalArgumentException:
No enum constant org.apache.calcite.sql.SqlKind.APPROX_QUANTILE" if the query
contains an APPROX_QUANTILE aggregation.

Signed-off-by: Andrey Pavlenko <[email protected]>

Author: AndreyPavlenko

omniscidb/Calcite/java/calcite/src/main/java/org/apache/calcite/rel/externalize/MapDRelJson.java

@@ -562,11 +562,6 @@ private SqlOperator toOp(String op, Map<String, Object> map) {
   }
 
   SqlOperator toOp(RelInput relInput, String name) {
-    // in case different operator has the same kind, check with both name and kind.
-    String kind = name;
-    String syntax = "FUNCTION";
-    SqlKind sqlKind = SqlKind.valueOf(kind);
-    SqlSyntax sqlSyntax = SqlSyntax.valueOf(syntax);
     MapDSqlOperatorTable operatorTable =
             new MapDSqlOperatorTable(SqlStdOperatorTable.instance());
     MapDSqlOperatorTable.addUDF(operatorTable, null);