Remove NOT_YET code

Update comments
Add more tests for "let from query"

client/mysqltest.c

@@ -1777,40 +1777,22 @@ void var_query_set(VAR *var, const char *query, const char** query_end)
     die("Query '%s' didn't return a result set", ds_query.str);
   dynstr_free(&ds_query);
 
-  if ((row = mysql_fetch_row(res)) && row[0])
+  if ((row= mysql_fetch_row(res)) && row[0])
   {
     /*
-      Concatenate all row results with tab in between to allow us to work
-      with results from many columns (for example from SHOW VARIABLES)
+      Concatenate all fields in the first row with tab in between
+      and assign that string to the $variable
     */
     DYNAMIC_STRING result;
     uint i;
     ulong *lengths;
-#ifdef NOT_YET
-    MYSQL_FIELD *fields= mysql_fetch_fields(res);
-#endif
 
-    init_dynamic_string(&result, "", 2048, 2048);
+    init_dynamic_string(&result, "", 512, 512);
     lengths= mysql_fetch_lengths(res);
-    for (i=0; i < mysql_num_fields(res); i++)
+    for (i= 0; i < mysql_num_fields(res); i++)
     {
-      if (row[0])
+      if (row[i])
       {
-#ifdef NOT_YET
-	/* Add to <var_name>_<col_name> */
-	uint j;
-	char var_col_name[MAX_VAR_NAME_LENGTH];
-	uint length= snprintf(var_col_name, MAX_VAR_NAME_LENGTH,
-			      "$%s_%s", var->name, fields[i].name);
-	/* Convert characters not allowed in variable names to '_' */
-	for (j= 1; j < length; j++)
-	{
-	  if (!my_isvar(charset_info,var_col_name[j]))
-            var_col_name[j]= '_';
-        }
-	var_set(var_col_name,  var_col_name + length,
-		row[i], row[i] + lengths[i]);
-#endif
         /* Add column to tab separated string */
 	dynstr_append_mem(&result, row[i], lengths[i]);
       }

mysql-test/r/mysqltest.result

@@ -280,6 +280,18 @@ let $B = changed value of B;
 var2: content of variable 1
 var3: content of variable 1 content of variable 1
 length of var3 is longer than 0
+var1
+hi	1	hi there
+var2
+2
+var2 again
+2
+var3 two columns with same name
+1	2	3
+var4 from query that returns NULL
+var5 from query that returns no row
+failing query in let
+mysqltest: At line 1: Error running query 'failing query': 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'failing query' at line 1
 mysqltest: At line 1: Missing required argument 'filename' to command 'source'
 mysqltest: At line 1: Could not open file ./non_existingFile
 mysqltest: In included file "MYSQLTEST_VARDIR/tmp/recursive.sql": At line 1: Source directives are nesting too deep

mysql-test/t/mysqltest.test

@@ -736,38 +736,40 @@ if (`select length("$var3") > 0`)
 # Test to assign let from query
 # let $<var_name>=`<query>`;
 # ----------------------------------------------------------------------------
---disable_parsing
 echo var1;
 let $var1= `select "hi" as "Col", 1 as "Column1", "hi there" as Col3`;
 echo $var1;
-echo $var1_Col;
-echo $var1_Column1;
-echo $var1_Col3;
 
 echo var2;
 let $var2= `select 2 as "Column num 2"`;
 echo $var2;
-echo $var2_Column num 2;
-echo $var2_Column;
 
 echo var2 again;
 let $var2= `select 2 as "Column num 2"`;
 echo $var2;
-echo $var2_Column num 2;
-echo $var2_Column_num_2;
-echo $var2_Column;
 
 echo var3 two columns with same name;
 let $var3= `select 1 as "Col", 2 as "Col", 3 as "var3"`;
 echo $var3;
-echo $var3_Col;
-echo $var3_Col;
-echo $var3_var3;
 
-#echo failing query in let;
-#--error 1
-#--exec echo "let $var2= `failing query;`" | $MYSQL_TEST 2>&1
---enable_parsing
+echo var4 from query that returns NULL;
+let $var4= `select NULL`;
+
+echo var5 from query that returns no row;
+let $var5= `SHOW VARIABLES LIKE "nonexisting_variable"`;
+
+echo failing query in let;
+--write_file $MYSQLTEST_VARDIR/tmp/let.sql
+let $var2= `failing query`;
+echo $var2;
+EOF
+
+--error 1
+--exec $MYSQL_TEST < $MYSQLTEST_VARDIR/tmp/let.sql 2>&1
+
+remove_file $MYSQLTEST_VARDIR/tmp/let.sql;
+
+
 # ----------------------------------------------------------------------------
 # Test source command
 # ----------------------------------------------------------------------------