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Overview
Comment:Defer deleting subqueries in the compound-SELECT code generator until the end of code generation, in order to avoid deleting expressions out from under the aggregation function sanity checking assert()s that occur near the end of SELECT code generation. This fixes the assertion fault described by forum post cfcb4b461d. The problem goes back to check-in [6e6b3729e0549de0].
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SHA3-256: 600f1991e5c0a5d89cd8776a157b6fd72c7489791085876925e8dd7ab146fe1f
User & Date: drh 2021-08-21 16:42:58
Original Comment: Defer deleting subqueries in the compound-SELECT code generator until the end of code generation, in order to avoid deleting expressions out from under the aggregation function sanity checking assert()s that occur near the end of SELECT code generation. This fixes the assertion fault described by forum post cfcb4b461d.
Context
2021-08-21
20:54
Allow typeless columns in STRICT tables that are able to accept any data type. (check-in: 1e2dcc2d user: drh tags: trunk)
16:42
Defer deleting subqueries in the compound-SELECT code generator until the end of code generation, in order to avoid deleting expressions out from under the aggregation function sanity checking assert()s that occur near the end of SELECT code generation. This fixes the assertion fault described by forum post cfcb4b461d. The problem goes back to check-in [6e6b3729e0549de0]. (check-in: 600f1991 user: drh tags: trunk)
2021-08-20
19:51
Improvement to error handling in Lemon. No impact on SQLite. Forum post 2f468f43cbc48d7f (check-in: 18cc2f85 user: drh tags: trunk)
Changes
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Changes to src/select.c.

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    }
    sqlite3KeyInfoUnref(pKeyInfo);
  }

multi_select_end:
  pDest->iSdst = dest.iSdst;
  pDest->nSdst = dest.nSdst;


  sqlite3SelectDelete(db, pDelete);


  return rc;
}
#endif /* SQLITE_OMIT_COMPOUND_SELECT */

/*
** Error message for when two or more terms of a compound select have different
** size result sets.







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    }
    sqlite3KeyInfoUnref(pKeyInfo);
  }

multi_select_end:
  pDest->iSdst = dest.iSdst;
  pDest->nSdst = dest.nSdst;
  if( pDelete ){
    sqlite3ParserAddCleanup(pParse,
        (void(*)(sqlite3*,void*))sqlite3SelectDelete,
        pDelete);
  }
  return rc;
}
#endif /* SQLITE_OMIT_COMPOUND_SELECT */

/*
** Error message for when two or more terms of a compound select have different
** size result sets.

Changes to test/minmax.test.

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  SELECT min(a) FROM t14 WHERE b='2' AND a>'50';
} {100}
do_execsql_test 14.2 {
  CREATE INDEX t14ba ON t14(b,a);
  SELECT min(a) FROM t14 WHERE b='2' AND a>'50';
} {100}













finish_test







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  SELECT min(a) FROM t14 WHERE b='2' AND a>'50';
} {100}
do_execsql_test 14.2 {
  CREATE INDEX t14ba ON t14(b,a);
  SELECT min(a) FROM t14 WHERE b='2' AND a>'50';
} {100}

# 2021-08-21.  https://sqlite.org/forum/forumpost/cfcb4b461d
# 
reset_db
do_execsql_test 15.1 {
  CREATE TABLE t1(a);
  CREATE TABLE t2(b);
  CREATE TABLE t3(c);
  INSERT INTO t1 VALUES(0);
  INSERT INTO t2 VALUES(5);
  SELECT MIN((SELECT b FROM t2 UNION SELECT x FROM (SELECT x FROM (SELECT 1 AS x WHERE t1.a=1) UNION ALL SELECT c FROM t3))) FROM t1;
} {5}

finish_test