Revert partial of opensearch-project#4401 (opensearch-project#4503)

Author: LantaoJin

opensearch/src/main/java/org/opensearch/sql/opensearch/util/JdbcOpenSearchDataTypeConvertor.java

@@ -98,7 +98,6 @@ public static ExprValue getExprValueFromSqlType(
           return ExprValueUtils.fromObjectValue(rs.getFloat(i));
 
         case Types.DECIMAL:
-          return ExprValueUtils.fromObjectValue(rs.getBigDecimal(i));
         case Types.NUMERIC:
         case Types.DOUBLE:
           return ExprValueUtils.fromObjectValue(rs.getDouble(i));