mirror of https://github.com/sqlite/sqlite
Begin adding code to support multiple IN constraints on the same index. (CVS 2557)
FossilOrigin-Name: 103f8ccb9013689a480766ebffbf570d4aa8bac5
This commit is contained in:
drh
parent
29dda4ae65
commit
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manifest
14
manifest
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@ -1,5 +1,5 @@
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C Split\sthe\sOP_Integer\sopcode\sinto\sOP_Integer\sand\sOP_Int64.\s\sThis\sallows\ncomments\sto\sbe\sadded\sto\sOP_Integer.\s\sCleanup\sin\sthe\soptimizer.\s\sAllow\nterms\sof\sthe\sFROM\sclause\sto\sbe\sreordered\sautomatically.\s(CVS\s2556)
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D 2005-07-21T18:23:20
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C Begin\sadding\scode\sto\ssupport\smultiple\sIN\sconstraints\son\sthe\ssame\sindex.\s(CVS\s2557)
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D 2005-07-22T00:31:40
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F Makefile.in 22ea9c0fe748f591712d8fe3c6d972c6c173a165
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F Makefile.linux-gcc 06be33b2a9ad4f005a5f42b22c4a19dab3cbb5c7
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F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
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@ -64,7 +64,7 @@ F src/random.c 90adff4e73a3b249eb4f1fc2a6ff9cf78c7233a4
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F src/select.c c611471052773b94af771693686bd5bcdbbb0dba
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F src/shell.c 25b3217d7c64e6497225439d261a253a23efff26
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F src/sqlite.h.in 838382ed6b48d392366a55e07f49d9d71263e1fe
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F src/sqliteInt.h 89ace2d46348c2924368ff97d41adec5cacacfdc
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F src/sqliteInt.h 810f2ccd49338944ec53c95182e5a8b56da42fa0
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F src/table.c 25b3ff2b39b7d87e8d4a5da0713d68dfc06cbee9
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F src/tclsqlite.c cccaf6b78c290d824cf8ea089b8b27377e545830
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F src/test1.c 722c1444b5774705eb6eb11163343fc94ffe17f7
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@ -85,7 +85,7 @@ F src/vdbeapi.c 7f392f0792d1258c958083d7de9eae7c3530c9a6
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F src/vdbeaux.c 3732a86566a6be4da4c606e9334baf3fd98667af
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F src/vdbefifo.c b8805850afe13b43f1de78d58088cb5d66f88e1e
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F src/vdbemem.c da8e8d6f29dd1323f782f000d7cd120027c9ff03
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F src/where.c 65d9b27edaf29edaba95442f65a3cfc36ae6dbdb
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F src/where.c 70b2195b4732ce785be32140f982b2ed471d205d
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F tclinstaller.tcl 046e3624671962dc50f0481d7c25b38ef803eb42
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F test/all.test 7f0988442ab811dfa41793b5b550f5828ce316f3
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F test/alter.test 9d6837a3d946b73df692b7cef2a7644d2e2f6bc6
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@ -286,7 +286,7 @@ F www/tclsqlite.tcl 425be741b8ae664f55cb1ef2371aab0a75109cf9
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F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
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F www/version3.tcl a99cf5f6d8bd4d5537584a2b342f0fb9fa601d8b
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F www/whentouse.tcl 528299b8316726dbcc5548e9aa0648c8b1bd055b
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P ef3a157f469d72cbd2f713f997598ddf47f340d2
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R 36cfab460ee644fb8d42d82df874b83c
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P e2f822ac82d0a5a59de0b63cce65d4fd6c178ff1
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R 156ee4225ef63d3a2b0a126183a1b6ad
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U drh
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Z b75bf1e0203a3ee4b4ae420ba35e8ecb
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Z b87a4baf4ad23e926496089f67763fa0
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@ -1 +1 @@
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e2f822ac82d0a5a59de0b63cce65d4fd6c178ff1
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103f8ccb9013689a480766ebffbf570d4aa8bac5
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@ -11,7 +11,7 @@
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*************************************************************************
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** Internal interface definitions for SQLite.
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**
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** @(#) $Id: sqliteInt.h,v 1.396 2005/07/21 18:23:20 drh Exp $
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** @(#) $Id: sqliteInt.h,v 1.397 2005/07/22 00:31:40 drh Exp $
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*/
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#ifndef _SQLITEINT_H_
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#define _SQLITEINT_H_
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@ -960,7 +960,8 @@ struct WhereLevel {
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int cont; /* Jump here to continue with the next loop cycle */
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int top; /* First instruction of interior of the loop */
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int op, p1, p2; /* Opcode used to terminate the loop */
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int inOp, inP1, inP2; /* Opcode used to implement an IN operator */
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int nIn; /* Number of IN operators constraining this loop */
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int *aInLoop; /* Loop terminators for IN operators */
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};
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/*
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116
src/where.c
116
src/where.c
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@ -16,7 +16,7 @@
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** so is applicable. Because this module is responsible for selecting
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** indices, you might also think of this module as the "query optimizer".
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**
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** $Id: where.c,v 1.150 2005/07/21 18:23:20 drh Exp $
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** $Id: where.c,v 1.151 2005/07/22 00:31:40 drh Exp $
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*/
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#include "sqliteInt.h"
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@ -97,6 +97,35 @@ struct WhereClause {
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WhereTerm aStatic[10]; /* Initial static space for the terms */
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};
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/*
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** When WhereTerms are used to select elements from an index, we
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** call those terms "constraints". For example, consider the following
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** SQL:
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**
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** CREATE TABLE t1(a INTEGER PRIMARY KEY, b, c, d);
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** CREATE INDEX t1i1 ON t1(b,c);
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**
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** SELECT * FROM t1 WHERE d=5 AND b=7 AND c>11;
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**
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** In the SELECT statement, the "b=7" and "c>11" terms are constraints
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** because they can be used to choose rows out of the t1i1 index. But
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** the "d=5" term is not a constraint because it is not indexed.
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**
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** When generating code to access an index, we have to keep track of
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** all of the constraints associated with that index. This is done
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** using an array of instanaces of the following structure. There is
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** one instance of this structure for each constraint on the index.
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**
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** Actually, we allocate the array of this structure based on the total
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** number of terms in the entire WHERE clause (because the number of
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** constraints can never be more than that) and reuse it when coding
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** each index.
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*/
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typedef struct WhereConstraint WhereConstraint;
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struct WhereConstraint {
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int iMem; /* Mem cell used to hold <expr> part of constraint */
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};
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/*
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** An instance of the following structure keeps track of a mapping
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** between VDBE cursor numbers and bits of the bitmasks in WhereTerm.
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@ -242,11 +271,6 @@ static void createMask(ExprMaskSet *pMaskSet, int iCursor){
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pMaskSet->ix[pMaskSet->n++] = iCursor;
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}
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/*
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** Destroy an expression mask set
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*/
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#define freeMaskSet(P) /* NO-OP */
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/*
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** This routine walks (recursively) an expression tree and generates
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** a bitmask indicating which tables are used in that expression
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@ -576,16 +600,18 @@ static int sortableByRowid(
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/*
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** Value for flags returned by bestIndex()
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*/
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#define WHERE_ROWID_EQ 0x001 /* rowid=EXPR or rowid IN (...) */
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#define WHERE_ROWID_RANGE 0x002 /* rowid<EXPR and/or rowid>EXPR */
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#define WHERE_COLUMN_EQ 0x004 /* x=EXPR or x IN (...) */
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#define WHERE_COLUMN_RANGE 0x008 /* x<EXPR and/or x>EXPR */
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#define WHERE_SCAN 0x010 /* Do a full table scan */
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#define WHERE_REVERSE 0x020 /* Scan in reverse order */
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#define WHERE_ORDERBY 0x040 /* Output will appear in correct order */
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#define WHERE_IDX_ONLY 0x080 /* Use index only - omit table */
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#define WHERE_TOP_LIMIT 0x100 /* x<EXPR or x<=EXPR constraint */
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#define WHERE_BTM_LIMIT 0x200 /* x>EXPR or x>=EXPR constraint */
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#define WHERE_ROWID_EQ 0x0001 /* rowid=EXPR or rowid IN (...) */
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#define WHERE_ROWID_RANGE 0x0002 /* rowid<EXPR and/or rowid>EXPR */
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#define WHERE_COLUMN_EQ 0x0004 /* x=EXPR or x IN (...) */
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#define WHERE_COLUMN_RANGE 0x0008 /* x<EXPR and/or x>EXPR */
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#define WHERE_SCAN 0x0010 /* Do a full table scan */
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#define WHERE_REVERSE 0x0020 /* Scan in reverse order */
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#define WHERE_ORDERBY 0x0040 /* Output will appear in correct order */
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#define WHERE_IDX_ONLY 0x0080 /* Use index only - omit table */
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#define WHERE_TOP_LIMIT 0x0100 /* x<EXPR or x<=EXPR constraint */
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#define WHERE_BTM_LIMIT 0x0200 /* x>EXPR or x>=EXPR constraint */
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#define WHERE_USES_IN 0x0400 /* True if the IN operator is used */
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#define WHERE_UNIQUE 0x0800 /* True if fully specifies a unique idx */
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/*
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** Find the best index for accessing a particular table. Return the index,
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@ -619,7 +645,7 @@ static double bestIndex(
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if( pOrderBy ) *pFlags |= WHERE_ORDERBY;
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return 1.0e10;
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}else{
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*pFlags = WHERE_ROWID_EQ;
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*pFlags = WHERE_ROWID_EQ | WHERE_USES_IN;
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return 1.0e9;
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}
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}
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@ -675,12 +701,22 @@ static double bestIndex(
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/* The optimization type is RANGE if there are no == or IN constraints
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*/
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if( usesIN || nEq ){
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if( usesIN ){
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flags = WHERE_COLUMN_EQ | WHERE_USES_IN;
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}else if( nEq ){
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flags = WHERE_COLUMN_EQ;
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}else{
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flags = WHERE_COLUMN_RANGE;
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}
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/* Check for a uniquely specified row
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*/
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#if 0
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if( nEq==pProbe->nColumn && pProbe->isUnique ){
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flags |= WHERE_UNIQUE;
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}
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#endif
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/* Look for range constraints
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*/
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if( !usesIN && nEq<pProbe->nColumn ){
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@ -819,7 +855,7 @@ static void buildIndexProbe(Vdbe *v, int nColumn, int brk, Index *pIdx){
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*/
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static void codeEqualityTerm(
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Parse *pParse, /* The parsing context */
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WhereTerm *pTerm, /* The term of the WHERE clause to be coded */
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WhereTerm *pTerm, /* The term of the WHERE clause to be coded */
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int brk, /* Jump here to abandon the loop */
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WhereLevel *pLevel /* When level of the FROM clause we are working on */
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){
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@ -830,15 +866,22 @@ static void codeEqualityTerm(
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#ifndef SQLITE_OMIT_SUBQUERY
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}else{
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int iTab;
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int *aIn;
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Vdbe *v = pParse->pVdbe;
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sqlite3CodeSubselect(pParse, pX);
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iTab = pX->iTable;
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sqlite3VdbeAddOp(v, OP_Rewind, iTab, brk);
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VdbeComment((v, "# %.*s", pX->span.n, pX->span.z));
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pLevel->inP2 = sqlite3VdbeAddOp(v, OP_Column, iTab, 0);
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pLevel->inOp = OP_Next;
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pLevel->inP1 = iTab;
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pLevel->nIn++;
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pLevel->aInLoop = aIn = sqliteRealloc(pLevel->aInLoop,
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sizeof(pLevel->aInLoop[0])*3*pLevel->nIn);
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if( aIn ){
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aIn += pLevel->nIn*3 - 3;
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aIn[0] = OP_Next;
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aIn[1] = iTab;
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aIn[2] = sqlite3VdbeAddOp(v, OP_Column, iTab, 0);
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}
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#endif
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}
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disableTerm(pLevel, pTerm);
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@ -961,6 +1004,7 @@ WhereInfo *sqlite3WhereBegin(
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struct SrcList_item *pTabItem; /* A single entry from pTabList */
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WhereLevel *pLevel; /* A single level in the pWInfo list */
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int iFrom; /* First unused FROM clause element */
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WhereConstraint *aConstraint; /* Information on constraints */
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/* The number of tables in the FROM clause is limited by the number of
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** bits in a Bitmask
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@ -982,9 +1026,7 @@ WhereInfo *sqlite3WhereBegin(
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*/
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pWInfo = sqliteMalloc( sizeof(WhereInfo) + pTabList->nSrc*sizeof(WhereLevel));
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if( sqlite3_malloc_failed ){
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sqliteFree(pWInfo); /* Avoid leaking memory when malloc fails */
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whereClauseClear(&wc);
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return 0;
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goto whereBeginNoMem;
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}
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pWInfo->pParse = pParse;
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pWInfo->pTabList = pTabList;
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@ -1009,6 +1051,10 @@ WhereInfo *sqlite3WhereBegin(
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for(i=wc.nTerm-1; i>=0; i--){
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exprAnalyze(pTabList, &maskSet, &wc.a[i]);
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}
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aConstraint = sqliteMalloc( wc.nTerm*sizeof(aConstraint[0]) );
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if( aConstraint==0 && wc.nTerm>0 ){
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goto whereBeginNoMem;
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}
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/* Chose the best index to use for each table in the FROM clause.
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**
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}
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pLevel->flags = bestFlags;
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pLevel->pIdx = pBest;
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pLevel->aInLoop = 0;
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pLevel->nIn = 0;
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if( pBest ){
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pLevel->iIdxCur = pParse->nTab++;
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}else{
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@ -1113,7 +1161,6 @@ WhereInfo *sqlite3WhereBegin(
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iCur = pTabItem->iCursor;
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pIdx = pLevel->pIdx;
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iIdxCur = pLevel->iIdxCur;
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pLevel->inOp = OP_Noop;
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bRev = (pLevel->flags & WHERE_REVERSE)!=0;
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omitTable = (pLevel->flags & WHERE_IDX_ONLY)!=0;
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@ -1511,9 +1558,15 @@ WhereInfo *sqlite3WhereBegin(
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** clean up and return.
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*/
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pWInfo->iContinue = cont;
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freeMaskSet(&maskSet);
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whereClauseClear(&wc);
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sqliteFree(aConstraint);
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return pWInfo;
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/* Jump here if malloc fails */
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whereBeginNoMem:
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whereClauseClear(&wc);
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sqliteFree(pWInfo);
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return 0;
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}
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/*
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@ -1535,8 +1588,13 @@ void sqlite3WhereEnd(WhereInfo *pWInfo){
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sqlite3VdbeAddOp(v, pLevel->op, pLevel->p1, pLevel->p2);
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}
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sqlite3VdbeResolveLabel(v, pLevel->brk);
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if( pLevel->inOp!=OP_Noop ){
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sqlite3VdbeAddOp(v, pLevel->inOp, pLevel->inP1, pLevel->inP2);
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if( pLevel->nIn ){
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int *a;
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int j;
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for(j=pLevel->nIn, a=&pLevel->aInLoop[j*3-3]; j>0; j--, a-=3){
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sqlite3VdbeAddOp(v, a[0], a[1], a[2]);
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}
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sqliteFree(pLevel->aInLoop);
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}
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if( pLevel->iLeftJoin ){
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int addr;
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