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Comment:Allow deterministic functions in the WHERE clause of a partial index.
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SHA1: c6e9b9421805c904b20900b711fa0e51773aef3e
User & Date: drh 2016-10-03 18:13:23
Context
2016-10-04
00:47
Do not bother to initialize unused fields in the BtreePayload object. (check-in: b10d0f93 user: drh tags: trunk)
2016-10-03
18:13
Allow deterministic functions in the WHERE clause of a partial index. (check-in: c6e9b942 user: drh tags: trunk)
16:33
Size and performance optimizations on the sqlite3ExprAssignVarNumber() routine. (check-in: 109852e5 user: drh tags: trunk)
Changes
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Changes to src/resolve.c. 

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      const char *zColumn;
      const char *zTable;
      const char *zDb;
      Expr *pRight;

      /* if( pSrcList==0 ) break; */
      notValid(pParse, pNC, "the \".\" operator", NC_IdxExpr);
      /*notValid(pParse, pNC, "the \".\" operator", NC_PartIdx|NC_IsCheck, 1);*/
      pRight = pExpr->pRight;
      if( pRight->op==TK_ID ){
        zDb = 0;
        zTable = pExpr->pLeft->u.zToken;
        zColumn = pRight->u.zToken;
      }else{
        assert( pRight->op==TK_DOT );
................................................................................
      int is_agg = 0;             /* True if is an aggregate function */
      int nId;                    /* Number of characters in function name */
      const char *zId;            /* The function name. */
      FuncDef *pDef;              /* Information about the function */
      u8 enc = ENC(pParse->db);   /* The database encoding */

      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
      notValid(pParse, pNC, "functions", NC_PartIdx);
      zId = pExpr->u.zToken;
      nId = sqlite3Strlen30(zId);
      pDef = sqlite3FindFunction(pParse->db, zId, n, enc, 0);
      if( pDef==0 ){
        pDef = sqlite3FindFunction(pParse->db, zId, -2, enc, 0);
        if( pDef==0 ){
          no_such_func = 1;
................................................................................
          ** constant because they are constant for the duration of one query */
          ExprSetProperty(pExpr,EP_ConstFunc);
        }
        if( (pDef->funcFlags & SQLITE_FUNC_CONSTANT)==0 ){
          /* Date/time functions that use 'now', and other functions like
          ** sqlite_version() that might change over time cannot be used
          ** in an index. */
          notValid(pParse, pNC, "non-deterministic functions", NC_IdxExpr);

        }
      }
      if( is_agg && (pNC->ncFlags & NC_AllowAgg)==0 ){
        sqlite3ErrorMsg(pParse, "misuse of aggregate function %.*s()", nId,zId);
        pNC->nErr++;
        is_agg = 0;
      }else if( no_such_func && pParse->db->init.busy==0








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      const char *zColumn;
      const char *zTable;
      const char *zDb;
      Expr *pRight;

      /* if( pSrcList==0 ) break; */
      notValid(pParse, pNC, "the \".\" operator", NC_IdxExpr);

      pRight = pExpr->pRight;
      if( pRight->op==TK_ID ){
        zDb = 0;
        zTable = pExpr->pLeft->u.zToken;
        zColumn = pRight->u.zToken;
      }else{
        assert( pRight->op==TK_DOT );
................................................................................
      int is_agg = 0;             /* True if is an aggregate function */
      int nId;                    /* Number of characters in function name */
      const char *zId;            /* The function name. */
      FuncDef *pDef;              /* Information about the function */
      u8 enc = ENC(pParse->db);   /* The database encoding */

      assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
//      notValid(pParse, pNC, "functions", NC_PartIdx);
      zId = pExpr->u.zToken;
      nId = sqlite3Strlen30(zId);
      pDef = sqlite3FindFunction(pParse->db, zId, n, enc, 0);
      if( pDef==0 ){
        pDef = sqlite3FindFunction(pParse->db, zId, -2, enc, 0);
        if( pDef==0 ){
          no_such_func = 1;
................................................................................
          ** constant because they are constant for the duration of one query */
          ExprSetProperty(pExpr,EP_ConstFunc);
        }
        if( (pDef->funcFlags & SQLITE_FUNC_CONSTANT)==0 ){
          /* Date/time functions that use 'now', and other functions like
          ** sqlite_version() that might change over time cannot be used
          ** in an index. */
          notValid(pParse, pNC, "non-deterministic functions",
                   NC_IdxExpr|NC_PartIdx);
        }
      }
      if( is_agg && (pNC->ncFlags & NC_AllowAgg)==0 ){
        sqlite3ErrorMsg(pParse, "misuse of aggregate function %.*s()", nId,zId);
        pNC->nErr++;
        is_agg = 0;
      }else if( no_such_func && pParse->db->init.busy==0

Changes to test/index6.test. 

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    CREATE INDEX bad1 ON t1(a,b) WHERE a!=?1;
  }
} {1 {parameters prohibited in partial index WHERE clauses}}
do_test index6-1.5 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE a!=random();
  }
} {1 {functions prohibited in partial index WHERE clauses}}
do_test index6-1.6 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE a NOT LIKE 'abc%';
  }
} {1 {functions prohibited in partial index WHERE clauses}}




do_test index6-1.10 {
  execsql {
    ANALYZE;
    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;
    PRAGMA integrity_check;
  }








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    CREATE INDEX bad1 ON t1(a,b) WHERE a!=?1;
  }
} {1 {parameters prohibited in partial index WHERE clauses}}
do_test index6-1.5 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE a!=random();
  }
} {1 {non-deterministic functions prohibited in partial index WHERE clauses}}
do_test index6-1.6 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE a NOT LIKE 'abc%';
  }
} {0 {}}
do_execsql_test index6-1.7 {
  DROP INDEX IF EXISTS bad1;
}

do_test index6-1.10 {
  execsql {
    ANALYZE;
    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;
    PRAGMA integrity_check;
  }

Changes to test/index7.test. 

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    CREATE INDEX bad1 ON t1(a,b) WHERE a!=?1;
  }
} {1 {parameters prohibited in partial index WHERE clauses}}
do_test index7-1.5 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE a!=random();
  }
} {1 {functions prohibited in partial index WHERE clauses}}
do_test index7-1.6 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE a NOT LIKE 'abc%';
  }
} {1 {functions prohibited in partial index WHERE clauses}}














do_test index7-1.10 {
  execsql {
    ANALYZE;
    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;
    PRAGMA integrity_check;
  }








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    CREATE INDEX bad1 ON t1(a,b) WHERE a!=?1;
  }
} {1 {parameters prohibited in partial index WHERE clauses}}
do_test index7-1.5 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE a!=random();
  }
} {1 {non-deterministic functions prohibited in partial index WHERE clauses}}
do_test index7-1.6 {
  catchsql {
    CREATE INDEX bad1 ON t1(a,b) WHERE a NOT LIKE 'abc%';
  }
} {0 {}}
do_execsql_test index7-1.7 {
  INSERT INTO t1(a,b,c)
     VALUES('abcde',1,101),('abdef',2,102),('xyz',3,103),('abcz',4,104);
  SELECT c FROM t1 WHERE a NOT LIKE 'abc%' AND a=7 ORDER BY +b;
} {7}
do_execsql_test index7-1.7eqp {
  EXPLAIN QUERY PLAN
  SELECT b FROM t1 WHERE a NOT LIKE 'abc%' AND a=7 ORDER BY +b;
} {/SEARCH TABLE t1 USING COVERING INDEX bad1 /}
do_execsql_test index7-1.8 {
  DELETE FROM t1 WHERE c>=101;
  DROP INDEX IF EXISTS bad1;
} {}

do_test index7-1.10 {
  execsql {
    ANALYZE;
    SELECT idx, stat FROM sqlite_stat1 ORDER BY idx;
    PRAGMA integrity_check;
  }

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