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Overview
Comment: | Make sure the left-hand side of the IS NOT NULL operator is a simple column and not a general expression before applying the IS NOT NULL optimization. This is a backport of check-in [543f75a6abe3]. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | branch-3.7.2 |
Files: | files | file ages | folders |
SHA1: |
e8177e0149280ea775e9aac18307ce25 |
User & Date: | drh 2011-04-08 23:04:28.400 |
Context
2011-04-08
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23:05 | Make sure the query planner is able to correctly analyze NULL value samples in the sqlite_stat2 table. This is a backport of changes from check-in [f73a167b434f] (check-in: 1d6378898a user: drh tags: branch-3.7.2) | |
23:04 | Make sure the left-hand side of the IS NOT NULL operator is a simple column and not a general expression before applying the IS NOT NULL optimization. This is a backport of check-in [543f75a6abe3]. (check-in: e8177e0149 user: drh tags: branch-3.7.2) | |
2011-03-31
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18:36 | Provide hints to the btree layer Next and Previous primitives to let them know if they can be no-ops if the underlying index is unique. (check-in: a5aae1743a user: drh tags: branch-3.7.2) | |
Changes
Changes to src/where.c.
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1339 1340 1341 1342 1343 1344 1345 | ** virtual term of that form. ** ** Note that the virtual term must be tagged with TERM_VNULL. This ** TERM_VNULL tag will suppress the not-null check at the beginning ** of the loop. Without the TERM_VNULL flag, the not-null check at ** the start of the loop will prevent any results from being returned. */ | | > > > | 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 | ** virtual term of that form. ** ** Note that the virtual term must be tagged with TERM_VNULL. This ** TERM_VNULL tag will suppress the not-null check at the beginning ** of the loop. Without the TERM_VNULL flag, the not-null check at ** the start of the loop will prevent any results from being returned. */ if( pExpr->op==TK_NOTNULL && pExpr->pLeft->op==TK_COLUMN && pExpr->pLeft->iColumn>=0 ){ Expr *pNewExpr; Expr *pLeft = pExpr->pLeft; int idxNew; WhereTerm *pNewTerm; pNewExpr = sqlite3PExpr(pParse, TK_GT, sqlite3ExprDup(db, pLeft, 0), |
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tool/mkopts.tcl became a regular file.
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