[TD-2175]<fix>: fix the error in result field name and nchar column length

src/client/src/tscSql.c

@@ -420,7 +420,16 @@ TAOS_FIELD *taos_fetch_fields(TAOS_RES *res) {
     for(int32_t i = 0; i < pFieldInfo->numOfOutput; ++i) {
       SInternalField* pField = tscFieldInfoGetInternalField(pFieldInfo, i);
       if (pField->visible) {
-        f[j++] = pField->field;
+        f[j] = pField->field;
+
+        // revise the length for binary and nchar fields
+        if (f[j].type == TSDB_DATA_TYPE_BINARY) {
+          f[j].bytes -= VARSTR_HEADER_SIZE;
+        } else if (f[j].type == TSDB_DATA_TYPE_NCHAR) {
+          f[j].bytes = (f[j].bytes - VARSTR_HEADER_SIZE)/TSDB_NCHAR_SIZE;
+        }
+
+        j += 1;
       }
     }
 

src/query/inc/sql.y

@@ -556,11 +556,11 @@ having_opt(A) ::= HAVING expr(X).   {A = X;}
 //limit-offset subclause
 %type limit_opt {SLimitVal}
 limit_opt(A) ::= .                     {A.limit = -1; A.offset = 0;}
-limit_opt(A) ::= LIMIT signed(X).      {printf("aa1, %d\n", X); A.limit = X;  A.offset = 0;}
+limit_opt(A) ::= LIMIT signed(X).      {A.limit = X;  A.offset = 0;}
 limit_opt(A) ::= LIMIT signed(X) OFFSET signed(Y).
-                                       {printf("aa2\n, %d\n", X); A.limit = X;  A.offset = Y;}
+                                       { A.limit = X;  A.offset = Y;}
 limit_opt(A) ::= LIMIT signed(X) COMMA signed(Y).
-                                       {printf("aa3\n, %d\n", X); A.limit = Y;  A.offset = X;}
+                                       { A.limit = Y;  A.offset = X;}
 
 %type slimit_opt {SLimitVal}
 slimit_opt(A) ::= .                    {A.limit = -1; A.offset = 0;}
@@ -581,7 +581,7 @@ where_opt(A) ::= WHERE expr(X).       {A = X;}
 %type expr {tSQLExpr*}
 %destructor expr {tSQLExprDestroy($$);}
 
-expr(A) ::= LP expr(X) RP.       {A = X; }
+expr(A) ::= LP(X) expr(Y) RP(Z).       {A = Y; A->token.z = X.z; A->token.n = (Z.z - X.z + 1);}
 
 expr(A) ::= ID(X).               {A = tSQLExprIdValueCreate(&X, TK_ID);}
 expr(A) ::= ID(X) DOT ID(Y).     {X.n += (1+Y.n); A = tSQLExprIdValueCreate(&X, TK_ID);}

src/query/src/sql.c

@@ -2628,16 +2628,14 @@ static void yy_reduce(
 {yymsp[1].minor.yy216.limit = -1; yymsp[1].minor.yy216.offset = 0;}
         break;
       case 177: /* limit_opt ::= LIMIT signed */
+      case 181: /* slimit_opt ::= SLIMIT signed */ yytestcase(yyruleno==181);
 {yymsp[-1].minor.yy216.limit = yymsp[0].minor.yy207;  yymsp[-1].minor.yy216.offset = 0;}
         break;
       case 178: /* limit_opt ::= LIMIT signed OFFSET signed */
-{yymsp[-3].minor.yy216.limit = yymsp[-2].minor.yy207;  yymsp[-3].minor.yy216.offset = yymsp[0].minor.yy207;}
+{ yymsp[-3].minor.yy216.limit = yymsp[-2].minor.yy207;  yymsp[-3].minor.yy216.offset = yymsp[0].minor.yy207;}
         break;
       case 179: /* limit_opt ::= LIMIT signed COMMA signed */
-{yymsp[-3].minor.yy216.limit = yymsp[0].minor.yy207;  yymsp[-3].minor.yy216.offset = yymsp[-2].minor.yy207;}
-        break;
-      case 181: /* slimit_opt ::= SLIMIT signed */
-{yymsp[-1].minor.yy216.limit = yymsp[0].minor.yy207;  yymsp[-1].minor.yy216.offset = 0;}
+{ yymsp[-3].minor.yy216.limit = yymsp[0].minor.yy207;  yymsp[-3].minor.yy216.offset = yymsp[-2].minor.yy207;}
         break;
       case 182: /* slimit_opt ::= SLIMIT signed SOFFSET signed */
 {yymsp[-3].minor.yy216.limit = yymsp[-2].minor.yy207;  yymsp[-3].minor.yy216.offset = yymsp[0].minor.yy207;}
@@ -2646,7 +2644,8 @@ static void yy_reduce(
 {yymsp[-3].minor.yy216.limit = yymsp[0].minor.yy207;  yymsp[-3].minor.yy216.offset = yymsp[-2].minor.yy207;}
         break;
       case 186: /* expr ::= LP expr RP */
-{yymsp[-2].minor.yy64 = yymsp[-1].minor.yy64; }
+{yylhsminor.yy64 = yymsp[-1].minor.yy64; yylhsminor.yy64->token.z = yymsp[-2].minor.yy0.z; yylhsminor.yy64->token.n = (yymsp[0].minor.yy0.z - yymsp[-2].minor.yy0.z + 1);}
+  yymsp[-2].minor.yy64 = yylhsminor.yy64;
         break;
       case 187: /* expr ::= ID */
 {yylhsminor.yy64 = tSQLExprIdValueCreate(&yymsp[0].minor.yy0, TK_ID);}