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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:The IS NOT NULL operator does not imply that the operand is never NULL. Fix for ticket [5948e09b8c415bc45da5cf]
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SHA3-256: d840e9bb023a1e84a7739d764a0f6cf608fc3183ff8c366fcdb486ebd932f0c1
User & Date: drh 2019-02-05 14:36:33
Context
2019-02-05
16:53
Update the tester.tcl --malloctrace option so that it uses eu-addr2line instead of addr2line. check-in: 79c07387 user: dan tags: trunk
14:36
The IS NOT NULL operator does not imply that the operand is never NULL. Fix for ticket [5948e09b8c415bc45da5cf] check-in: d840e9bb user: drh tags: trunk
12:16
Keep the temp_store_directory and data_store_directory pragmas even when compiling with SQLITE_OMIT_DEPRECATED. check-in: 93386a7c user: drh tags: trunk
Changes
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Changes to src/expr.c.

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  testcase( pExpr->op==TK_AGG_COLUMN );
  testcase( pExpr->op==TK_AGG_FUNCTION );
  if( ExprHasProperty(pExpr, EP_FromJoin) ) return WRC_Prune;
  switch( pExpr->op ){
    case TK_ISNOT:
    case TK_NOT:
    case TK_ISNULL:

    case TK_IS:
    case TK_OR:
    case TK_CASE:
    case TK_IN:
    case TK_FUNCTION:
      testcase( pExpr->op==TK_ISNOT );
      testcase( pExpr->op==TK_NOT );
      testcase( pExpr->op==TK_ISNULL );

      testcase( pExpr->op==TK_IS );
      testcase( pExpr->op==TK_OR );
      testcase( pExpr->op==TK_CASE );
      testcase( pExpr->op==TK_IN );
      testcase( pExpr->op==TK_FUNCTION );
      return WRC_Prune;
    case TK_COLUMN:







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  testcase( pExpr->op==TK_AGG_COLUMN );
  testcase( pExpr->op==TK_AGG_FUNCTION );
  if( ExprHasProperty(pExpr, EP_FromJoin) ) return WRC_Prune;
  switch( pExpr->op ){
    case TK_ISNOT:
    case TK_NOT:
    case TK_ISNULL:
    case TK_NOTNULL:
    case TK_IS:
    case TK_OR:
    case TK_CASE:
    case TK_IN:
    case TK_FUNCTION:
      testcase( pExpr->op==TK_ISNOT );
      testcase( pExpr->op==TK_NOT );
      testcase( pExpr->op==TK_ISNULL );
      testcase( pExpr->op==TK_NOTNULL );
      testcase( pExpr->op==TK_IS );
      testcase( pExpr->op==TK_OR );
      testcase( pExpr->op==TK_CASE );
      testcase( pExpr->op==TK_IN );
      testcase( pExpr->op==TK_FUNCTION );
      return WRC_Prune;
    case TK_COLUMN:

Changes to test/join.test.

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          ON x3 IS TRUE AND b4=a3
        JOIN (SELECT x AS x4 FROM t2)
          ON x4<=CASE WHEN x3 THEN CASE WHEN a4 THEN 1 ELSE -1 END ELSE 0 END
        LEFT JOIN (SELECT a AS a5, b AS b5 FROM t1)
          ON x4 IS TRUE AND b5=a4
   ORDER BY a1, a2, a3, a4, a5;
} {1 {} {} {} {} 1 11 {} {} {} 1 12 {} {} {} 1 12 121 {} {} 1 13 {} {} {}}















finish_test








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          ON x3 IS TRUE AND b4=a3
        JOIN (SELECT x AS x4 FROM t2)
          ON x4<=CASE WHEN x3 THEN CASE WHEN a4 THEN 1 ELSE -1 END ELSE 0 END
        LEFT JOIN (SELECT a AS a5, b AS b5 FROM t1)
          ON x4 IS TRUE AND b5=a4
   ORDER BY a1, a2, a3, a4, a5;
} {1 {} {} {} {} 1 11 {} {} {} 1 12 {} {} {} 1 12 121 {} {} 1 13 {} {} {}}

# 2019-02-05 Ticket https://www.sqlite.org/src/tktview/5948e09b8c415bc45da5c
# Error in join due to the LEFT JOIN strength reduction optimization.
#
do_execsql_test join-16.100 {
  DROP TABLE IF EXISTS t1;
  DROP TABLE IF EXISTS t2;
  CREATE TABLE t1(a INT);
  INSERT INTO t1(a) VALUES(1);
  CREATE TABLE t2(b INT);
  SELECT a, b
    FROM t1 LEFT JOIN t2 ON 0
   WHERE (b IS NOT NULL)=0;
} {1 {}}

finish_test