48d1178ad8
intermediate table if the SELECT clause refers to the destination table, even if the SELECT clause is compound or uses the destination table in a subquery. This fixes a long-standing bug that can cause an infinite loop for some SQL statements. (CVS 4552) FossilOrigin-Name: 492b39b6a8bf4ad8792d7a7949f77827a5047fd8
92 lines
2.5 KiB
Plaintext
92 lines
2.5 KiB
Plaintext
# 2007 November 23
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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# The tests in this file ensure that a temporary table is used
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# when required by an "INSERT INTO ... SELECT ..." statement.
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#
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# $Id: insert5.test,v 1.1 2007/11/23 15:02:19 drh Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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# Return true if the compilation of the sql passed as an argument
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# includes the opcode OpenEphemeral. An "INSERT INTO ... SELECT"
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# statement includes such an opcode if a temp-table is used
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# to store intermediate results.
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#
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proc uses_temp_table {sql} {
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return [expr {[lsearch [execsql "EXPLAIN $sql"] OpenEphemeral]>=0}]
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}
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# Construct the sample database.
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#
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do_test insert5-1.0 {
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file delete -force test2.db test2.db-journal
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execsql {
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CREATE TABLE MAIN(Id INTEGER, Id1 INTEGER);
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CREATE TABLE B(Id INTEGER, Id1 INTEGER);
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CREATE VIEW v1 AS SELECT * FROM B;
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CREATE VIEW v2 AS SELECT * FROM MAIN;
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INSERT INTO MAIN(Id,Id1) VALUES(2,3);
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INSERT INTO B(Id,Id1) VALUES(2,3);
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}
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} {}
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# Run the query.
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#
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do_test insert5-1.1 {
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execsql {
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INSERT INTO B
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SELECT * FROM B UNION ALL
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SELECT * FROM MAIN WHERE exists (select * FROM B WHERE B.Id = MAIN.Id);
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SELECT * FROM B;
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}
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} {2 3 2 3 2 3}
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do_test insert5-2.1 {
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uses_temp_table { INSERT INTO b SELECT * FROM main }
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} {0}
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do_test insert5-2.2 {
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uses_temp_table { INSERT INTO b SELECT * FROM b }
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} {1}
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do_test insert5-2.3 {
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uses_temp_table { INSERT INTO b SELECT (SELECT id FROM b), id1 FROM main }
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} {1}
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do_test insert5-2.4 {
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uses_temp_table { INSERT INTO b SELECT id1, (SELECT id FROM b) FROM main }
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} {1}
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do_test insert5-2.5 {
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uses_temp_table {
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INSERT INTO b
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SELECT * FROM main WHERE id = (SELECT id1 FROM b WHERE main.id = b.id) }
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} {1}
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do_test insert5-2.6 {
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uses_temp_table { INSERT INTO b SELECT * FROM v1 }
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} {1}
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do_test insert5-2.7 {
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uses_temp_table { INSERT INTO b SELECT * FROM v2 }
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} {0}
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do_test insert5-2.8 {
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uses_temp_table {
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INSERT INTO b
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SELECT * FROM main WHERE id > 10 AND max(id1, (SELECT id FROM b)) > 10;
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}
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} {1}
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do_test insert5-2.9 {
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uses_temp_table {
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INSERT INTO b
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SELECT * FROM main
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WHERE id > 10 AND (SELECT count(*) FROM v2 GROUP BY main.id)
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}
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} {1}
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finish_test
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