[CBRD-24473] Index scan cannot be used when a stored function is used…

… in a where condition. (#3811)

http://jira.cubrid.org/browse/CBRD-24473

I fixed it so that the method is treated as a pseudo constant in qo_analyze_terms().

'col1 = const' <== it is indexable.

There is one more problem. Index scan on correlated columns is not possible due to query rewrite in meth_translate() (check test cases for CBRD-24473.txt). I hope this will be fixed in the future.

src/optimizer/query_graph.c

@@ -3746,6 +3746,13 @@ pt_is_pseudo_const (PT_NODE * expr)
        */
       return true;
 
+    case PT_METHOD_CALL:
+      /*
+       * Even if there are columns(PT_NAME) in the parameter of the Java Stored Procedure(METHOD_CALL),
+       * it can be guaranteed to be evaluated by the time it is referenced.
+       */
+      return true;
+
     case PT_DOT_:
       /*
        * It would be nice if we could use expressions that are

src/parser/xasl_generation.c

@@ -7693,6 +7693,14 @@ pt_to_regu_variable (PARSER_CONTEXT * parser, PT_NODE * node, UNBOX unbox)
 	      break;
 
 	    case PT_METHOD_CALL:
+	      /*
+	         TODO : JSP containing column cannot be here because the query is rewritten in meth_translate().
+	         The index scan may not work because of the query rewrite in meth_translate().
+	         The method call should proceed in the same way as the internal function.
+	         pt_to_regu_variable() : generate regu_var for jsp function
+	         fetch_peek_dbval() : fetch regu_var for jsp function
+	       */
+
 	      /* a method call that can be evaluated as a constant expression. */
 	      regu_alloc (val);
 	      pt_evaluate_tree (parser, node, val, 1);