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Check-in [908ff7fffa]
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Overview
Comment:Fix a problem with using ALTER TABLE to rename a table or column when the database schema contains a trigger or view that itself contains an expression "<column> AND 0".
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SHA3-256: 908ff7fffa302255a74e2334ca3a1779ed43acb0268fce5a83a56fd16794dc88
User & Date: dan 2019-01-19 14:07:37.859
Context
2019-01-19
15:27
Remove a broken assert() triggered by a "PRAGMA max_page_count = N" invocation, where N is larger than the number of pages in the database image, but smaller than the number of pages in the database file. (check-in: 7cd56cad5e user: dan tags: trunk)
14:07
Fix a problem with using ALTER TABLE to rename a table or column when the database schema contains a trigger or view that itself contains an expression "<column> AND 0". (check-in: 908ff7fffa user: dan tags: trunk)
2019-01-18
21:17
Fix a memory leak introduced by [55c5d72a]. (check-in: fbd681dce2 user: dan tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/expr.c.
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Expr *sqlite3PExpr(
  Parse *pParse,          /* Parsing context */
  int op,                 /* Expression opcode */
  Expr *pLeft,            /* Left operand */
  Expr *pRight            /* Right operand */
){
  Expr *p;
  if( op==TK_AND && pParse->nErr==0 ){
    /* Take advantage of short-circuit false optimization for AND */
    p = sqlite3ExprAnd(pParse->db, pLeft, pRight);
  }else{
    p = sqlite3DbMallocRawNN(pParse->db, sizeof(Expr));
    if( p ){
      memset(p, 0, sizeof(Expr));
      p->op = op & TKFLG_MASK;








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Expr *sqlite3PExpr(
  Parse *pParse,          /* Parsing context */
  int op,                 /* Expression opcode */
  Expr *pLeft,            /* Left operand */
  Expr *pRight            /* Right operand */
){
  Expr *p;
  if( op==TK_AND && pParse->nErr==0 && !IN_RENAME_OBJECT ){
    /* Take advantage of short-circuit false optimization for AND */
    p = sqlite3ExprAnd(pParse->db, pLeft, pRight);
  }else{
    p = sqlite3DbMallocRawNN(pParse->db, sizeof(Expr));
    if( p ){
      memset(p, 0, sizeof(Expr));
      p->op = op & TKFLG_MASK;
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Changes to test/altertab2.test.
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do_catchsql_test 8.2 {
  ALTER TABLE t1 RENAME a TO aaa;
} {1 {error in trigger tr after rename: no such column: a}}
do_execsql_test 8.3 {
  INSERT INTO t3 VALUES(4, 5, 6);
}










finish_test










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do_catchsql_test 8.2 {
  ALTER TABLE t1 RENAME a TO aaa;
} {1 {error in trigger tr after rename: no such column: a}}
do_execsql_test 8.3 {
  INSERT INTO t3 VALUES(4, 5, 6);
}

do_execsql_test 8.1 {
  CREATE TABLE t4(a, b);
  CREATE VIEW v4 AS SELECT * FROM t4 WHERE (a=1 AND 0) OR b=2;
}
do_execsql_test 8.2 {
  ALTER TABLE t4 RENAME a TO c;
  SELECT sql FROM sqlite_master WHERE name = 'v4'
} {{CREATE VIEW v4 AS SELECT * FROM t4 WHERE (c=1 AND 0) OR b=2}}

finish_test