A SELECT statement inside the body of a TRIGGER uses the SRT_Discard target

to discard the query results.  Such selects are intended to be used to call
user-defined functions for their side-effects.  They do not return results. (CVS 594)

FossilOrigin-Name: f8041f3d4d3350b4086cd6ba3e9006bdde8546a9

manifest

@@ -1,5 +1,5 @@
-C Fix\sthe\s"alias.*"\sbug\sfound\sby\sBernie\sCosell\sand\sreported\son\sthe\snewsgroup.\s(CVS\s593)
+C A\sSELECT\sstatement\sinside\sthe\sbody\sof\sa\sTRIGGER\suses\sthe\sSRT_Discard\starget\nto\sdiscard\sthe\squery\sresults.\s\sSuch\sselects\sare\sintended\sto\sbe\sused\sto\scall\nuser-defined\sfunctions\sfor\stheir\sside-effects.\s\sThey\sdo\snot\sreturn\sresults.\s(CVS\s594)
-D 2002-05-27T03:25:52
+D 2002-05-27T12:24:48
 F Makefile.in 6291a33b87d2a395aafd7646ee1ed562c6f2c28c
 F Makefile.template 4e11752e0b5c7a043ca50af4296ec562857ba495
 F README a4c0ba11354ef6ba0776b400d057c59da47a4cc0
@@ -37,11 +37,11 @@ F src/pager.h 6fddfddd3b73aa8abc081b973886320e3c614f0e
 F src/parse.y c681da701bf142967325b8791f22418e2d81552d
 F src/printf.c d8032ee18b860c812eeff596c9bebfdacb7930fd
 F src/random.c 19e8e00fe0df32a742f115773f57651be327cabe
-F src/select.c f3c814e8fd4e6fbdd3fb8207e6c073bacc4761b8
+F src/select.c 6e84ac2be582382a4d9a81b9594456bb46babb1c
 F src/shell.c 1d22fe870ee852cfb975fd000dbe3973713d0a15
 F src/shell.tcl 27ecbd63dd88396ad16d81ab44f73e6c0ea9d20e
 F src/sqlite.h.in 0038faa6d642de06b91143ee65a131bd831d020b
-F src/sqliteInt.h 9de24fb527b3e472be19600e7c22534b981c8e61
+F src/sqliteInt.h 55824b7c87dcead71801354f90e4f1b1481f1d1e
 F src/table.c eed2098c9b577aa17f8abe89313a9c4413f57d63
 F src/tclsqlite.c 9300c9606a38bc0c75d6c0bc8a6197ab979353d1
 F src/test1.c 09d95048b66ce6dcd2bae90f443589043d7d631e
@@ -49,7 +49,7 @@ F src/test2.c 669cc22781c6461a273416ec1a7414d25c081730
 F src/test3.c 4e52fff8b01f08bd202f7633feda5639b7ba2b5e
 F src/threadtest.c 81f0598e0f031c1bd506af337fdc1b7e8dff263f
 F src/tokenize.c facec7dc0b4a13e17ad67702f548dac2f7c6a732
-F src/trigger.c b7a93ffa7b91dafff433e6c87d603bfb1d50e3ee
+F src/trigger.c d02f8e3510c7c2ad948a0e8c3bb0cca8adaf80c5
 F src/update.c f68375173bf5338cae3e97012708e10f206aedd9
 F src/util.c a9f6e6f03e8b7137204ac15b35a58f321e38037e
 F src/vdbe.c ccbee9fb9b98a2fc75400865d69531da36cbf0f1
@@ -135,7 +135,7 @@ F www/speed.tcl da8afcc1d3ccc5696cfb388a68982bc3d9f7f00f
 F www/sqlite.tcl 8b5884354cb615049aed83039f8dfe1552a44279
 F www/tclsqlite.tcl 1db15abeb446aad0caf0b95b8b9579720e4ea331
 F www/vdbe.tcl 2013852c27a02a091d39a766bc87cff329f21218
-P 0e268d0c0faa02c3f95e1567cf631b7a04bfbdf0
+P f562d542304c0c1b18b0cee78b1ecc353327a02e
-R 8c1d70156583ffb3a3f61c616d535c5f
+R 4bed1abb134d55e95bd53603b51baff9
 U drh
-Z 0d522217ffc292b5873b9c11d67f0320
+Z 69f73daa36e6cf51d72c20768fddcd68

manifest.uuid

@@ -1 +1 @@
-f562d542304c0c1b18b0cee78b1ecc353327a02e
+f8041f3d4d3350b4086cd6ba3e9006bdde8546a9

src/select.c

@@ -12,7 +12,7 @@
 ** This file contains C code routines that are called by the parser
 ** to handle SELECT statements in SQLite.
 **
-** $Id: select.c,v 1.87 2002/05/27 03:25:52 drh Exp $
+** $Id: select.c,v 1.88 2002/05/27 12:24:48 drh Exp $
 */
 #include "sqliteInt.h"
 
@@ -404,6 +404,15 @@ static int selectInnerLoop(
     sqliteVdbeAddOp(v, OP_Goto, 0, iBreak);
   }else
 
+  /* Discard the results.  This is used for SELECT statements inside
+  ** the body of a TRIGGER.  The purpose of such selects is to call
+  ** user-defined functions that have side effects.  We do not care
+  ** about the actual results of the select.
+  */
+  if( eDest==SRT_Discard ){
+    sqliteVdbeAddOp(v, OP_Pop, nColumn, 0);
+  }else
+
   /* If none of the above, send the data to the callback function.
   */
   {

src/sqliteInt.h

@@ -11,7 +11,7 @@
 *************************************************************************
 ** Internal interface definitions for SQLite.
 **
-** @(#) $Id: sqliteInt.h,v 1.117 2002/05/26 20:54:34 drh Exp $
+** @(#) $Id: sqliteInt.h,v 1.118 2002/05/27 12:24:49 drh Exp $
 */
 #include "sqlite.h"
 #include "hash.h"
@@ -540,6 +540,7 @@ struct Select {
 #define SRT_Except       6  /* Remove result from a UNION table */
 #define SRT_Table        7  /* Store result as data with a unique key */
 #define SRT_TempTable    8  /* Store result in a trasient table */
+#define SRT_Discard      9  /* Do not save the results anywhere */
 
 /*
 ** When a SELECT uses aggregate functions (like "count(*)" or "avg(f1)")

src/trigger.c

@@ -480,13 +480,7 @@ static int codeTriggerProgram(
     pParse->trigStack->orconf = orconf;
     switch( pTriggerStep->op ){
       case TK_SELECT: {
-        int tmp_tbl = pParse->nTab++;
+	sqliteSelect(pParse, pTriggerStep->pSelect, SRT_Discard, 0, 0, 0, 0);
-	sqliteVdbeAddOp(pParse->pVdbe, OP_OpenTemp, tmp_tbl, 0);
-	sqliteVdbeAddOp(pParse->pVdbe, OP_KeyAsData, tmp_tbl, 1);
-	sqliteSelect(pParse, pTriggerStep->pSelect, SRT_Union, 
-	    tmp_tbl, 0, 0, 0);
-	sqliteVdbeAddOp(pParse->pVdbe, OP_Close, tmp_tbl, 0);
-	pParse->nTab--;
 	break;
       }
       case TK_UPDATE: {