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Overview
| Comment: | Add support for ORDER BY clauses to schemalint.tcl. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | schemalint |
| Files: | files | file ages | folders |
| SHA1: | 93bdf70e859915ff3696ba0fc68f91ce |
| User & Date: | dan 2015-11-20 20:55:27 |
Context
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2015-11-23
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| 17:10 | Fix ORDER BY handling in the schemalint.tcl script. Add internal self-tests to the same script. check-in: b8f277c9 user: dan tags: schemalint | |
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2015-11-20
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| 20:55 | Add support for ORDER BY clauses to schemalint.tcl. check-in: 93bdf70e user: dan tags: schemalint | |
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2015-11-11
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| 18:08 | Add a hack to debug out a description of the WHERE clause of a SELECT (or other) statement. Use this in script tool/schemalint.tcl to automatically recommend indexes that might speed up specific queries. check-in: c6fa01c2 user: dan tags: schemalint | |
Changes
Changes to src/where.c.
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}
return zBuf;
}
static char *whereTraceWC(
Parse *pParse,
struct SrcList_item *pItem,
char *zIn,
WhereClause *pWC
){
sqlite3 *db = pParse->db;
Table *pTab = pItem->pTab;
char *zBuf = zIn;
int iCol;
int ii;
int bFirst = 1;
/* List of WO_SINGLE constraints */
for(iCol=0; iCol<pTab->nCol; iCol++){
int opMask = WO_SINGLE;
WhereScan scan;
WhereTerm *pTerm;
for(pTerm=whereScanInit(&scan, pWC, pItem->iCursor, iCol, opMask, 0);
................................................................................
/* Add composite - (WO_OR|WO_AND) - constraints */
for(ii=0; ii<pWC->nTerm; ii++){
WhereTerm *pTerm = &pWC->a[ii];
if( pTerm->eOperator & (WO_OR|WO_AND) ){
const char *zFmt = ((pTerm->eOperator&WO_OR) ? "%z%s{or " : "%z%s{");
zBuf = whereAppendPrintf(db, zFmt, zBuf, bFirst ? "" : " ");
zBuf = whereTraceWC(pParse, pItem, zBuf, &pTerm->u.pOrInfo->wc);
zBuf = whereAppendPrintf(db, "%z}", zBuf);
bFirst = 0;
}
}
return zBuf;
}
................................................................................
static void whereTraceBuilder(
Parse *pParse,
WhereLoopBuilder *p
){
sqlite3 *db = pParse->db;
if( db->xTrace ){
WhereInfo *pWInfo = p->pWInfo;
int nTablist = pWInfo->pTabList->nSrc;
int ii;
/* Loop through each element of the FROM clause. Ignore any sub-selects
** or views. Invoke the xTrace() callback once for each real table. */
for(ii=0; ii<nTablist; ii++){
................................................................................
for(iCol=0; iCol<nCol; iCol++){
if( iCol==(sizeof(Bitmask)*8-1) ) break;
if( pItem->colUsed & ((u64)1 << iCol) ){
zBuf = whereAppendPrintf(db, "%z %s", zBuf, pTab->aCol[iCol].zName);
}
}
}
zBuf = whereAppendPrintf(db, "%z} ", zBuf);
/* Append the contents of WHERE clause */
zBuf = whereTraceWC(pParse, pItem, zBuf, p->pWC);
/* Pass the buffer to the xTrace() callback, then free it */
db->xTrace(db->pTraceArg, zBuf);
sqlite3DbFree(db, zBuf);
}
}
}
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} return zBuf; } static char *whereTraceWC( Parse *pParse, int bInitialSpace, struct SrcList_item *pItem, char *zIn, WhereClause *pWC ){ sqlite3 *db = pParse->db; Table *pTab = pItem->pTab; char *zBuf = zIn; int iCol; int ii; int bFirst = !bInitialSpace; /* List of WO_SINGLE constraints */ for(iCol=0; iCol<pTab->nCol; iCol++){ int opMask = WO_SINGLE; WhereScan scan; WhereTerm *pTerm; for(pTerm=whereScanInit(&scan, pWC, pItem->iCursor, iCol, opMask, 0); ................................................................................ /* Add composite - (WO_OR|WO_AND) - constraints */ for(ii=0; ii<pWC->nTerm; ii++){ WhereTerm *pTerm = &pWC->a[ii]; if( pTerm->eOperator & (WO_OR|WO_AND) ){ const char *zFmt = ((pTerm->eOperator&WO_OR) ? "%z%s{or " : "%z%s{"); zBuf = whereAppendPrintf(db, zFmt, zBuf, bFirst ? "" : " "); zBuf = whereTraceWC(pParse, 0, pItem, zBuf, &pTerm->u.pOrInfo->wc); zBuf = whereAppendPrintf(db, "%z}", zBuf); bFirst = 0; } } return zBuf; } ................................................................................ static void whereTraceBuilder( Parse *pParse, WhereLoopBuilder *p ){ sqlite3 *db = pParse->db; if( db->xTrace ){ ExprList *pOrderBy = p->pOrderBy; WhereInfo *pWInfo = p->pWInfo; int nTablist = pWInfo->pTabList->nSrc; int ii; /* Loop through each element of the FROM clause. Ignore any sub-selects ** or views. Invoke the xTrace() callback once for each real table. */ for(ii=0; ii<nTablist; ii++){ ................................................................................ for(iCol=0; iCol<nCol; iCol++){ if( iCol==(sizeof(Bitmask)*8-1) ) break; if( pItem->colUsed & ((u64)1 << iCol) ){ zBuf = whereAppendPrintf(db, "%z %s", zBuf, pTab->aCol[iCol].zName); } } } zBuf = whereAppendPrintf(db, "%z}",zBuf); /* Append the contents of WHERE clause */ zBuf = whereTraceWC(pParse, 1, pItem, zBuf, p->pWC); /* Append the ORDER BY clause, if any */ if( pOrderBy ){ int i; int bFirst = 1; for(i=0; i<pOrderBy->nExpr; i++){ Expr *pExpr = pOrderBy->a[i].pExpr; CollSeq *pColl = sqlite3ExprCollSeq(pParse, pExpr); pExpr = sqlite3ExprSkipCollate(pExpr); if( pExpr->op==TK_COLUMN && pExpr->iTable==pItem->iCursor ){ if( pExpr->iColumn>=0 ){ const char *zName = pTab->aCol[pExpr->iColumn].zName; zBuf = whereAppendPrintf(db, "%z%s%s %s %s", zBuf, bFirst ? " {orderby " : " ", zName, pColl->zName, (pOrderBy->a[i].sortOrder ? "DESC" : "ASC") ); bFirst = 0; } } } if( bFirst==0 ) zBuf = whereAppendPrintf(db, "%z}", zBuf); } /* Pass the buffer to the xTrace() callback, then free it */ db->xTrace(db->pTraceArg, zBuf); sqlite3DbFree(db, zBuf); } } } |
Changes to test/schemalint.test.
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}
do_trace_test 2.3 {
SELECT * FROM t1 WHERE (a=? AND b=?) OR c=?
} {
{t1 {cols a b c} {or {{eq c BINARY 0}} {{eq a BINARY 0} {eq b BINARY 0}}}}
}
finish_test
|
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}
do_trace_test 2.3 {
SELECT * FROM t1 WHERE (a=? AND b=?) OR c=?
} {
{t1 {cols a b c} {or {{eq c BINARY 0}} {{eq a BINARY 0} {eq b BINARY 0}}}}
}
#-----------------------------------------------------------------------
# Cases involving ORDER BY.
#
do_trace_test 3.1 {
SELECT * FROM t1 ORDER BY a;
} {{t1 {cols a b c} {orderby a BINARY ASC}}}
do_trace_test 3.2 {
SELECT * FROM t1 WHERE a=? ORDER BY b;
} {{t1 {cols a b c} {eq a BINARY 0} {orderby b BINARY ASC}}}
do_trace_test 3.3 {
SELECT min(a) FROM t1;
} {{t1 {cols a} {orderby a BINARY ASC}}}
do_trace_test 3.4 {
SELECT max(a) FROM t1;
} {{t1 {cols a} {orderby a BINARY DESC}}}
finish_test
|
Changes to tool/schemalint.tcl.
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}
set ll $new
}
return $ll
}
proc eqset_to_index {tname eqset {range {}}} {
global G
set lCols [list]
set idxname $tname
foreach e [concat [lsort $eqset] [list $range]] {
if {[llength $e]==0} continue
foreach {c collate} $e {}
................................................................................
}
proc find_trial_indexes {} {
global G
foreach t $G(trace) {
set tname [lindex $t 0]
catch { array unset mask }
foreach lCons [expand_or_cons [lrange $t 2 end]] {
set constraints [list]
foreach a $lCons {
set type [lindex $a 0]
if {$type=="eq" || $type=="range"} {
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}
set ll $new
}
return $ll
}
#--------------------------------------------------------------------------
# Formulate a CREATE INDEX statement that creates an index on table $tname.
#
proc eqset_to_index {tname eqset {range {}}} {
global G
set lCols [list]
set idxname $tname
foreach e [concat [lsort $eqset] [list $range]] {
if {[llength $e]==0} continue
foreach {c collate} $e {}
................................................................................
}
proc find_trial_indexes {} {
global G
foreach t $G(trace) {
set tname [lindex $t 0]
catch { array unset mask }
if {[lindex $t end 0]=="orderby"} {
set orderby [lrange [lindex $t end] 1 end]
}
foreach lCons [expand_or_cons [lrange $t 2 end]] {
set constraints [list]
foreach a $lCons {
set type [lindex $a 0]
if {$type=="eq" || $type=="range"} {
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