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If terms of the WHERE clause require that the right table in a LEFT JOIN

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not be a null row, then simplify the LEFT JOIN into an ordinary JOIN.

FossilOrigin-Name: 5b7abecc7ab8ccbbb8cb5e0f672e67625c2555ad03442efbf34cb395f5bb71a8
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drh
2018-03-20 21:16:15 +00:00
parent f6e6f02308
commit 2589787c5a
7 changed files with 109 additions and 14 deletions
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2
test/join2.test
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@ -86,7 +86,7 @@ do_execsql_test 2.0 {
}
do_catchsql_test 2.1 {
SELECT * FROM aa LEFT JOIN cc ON (a=b) JOIN bb ON (b=c);
SELECT * FROM aa LEFT JOIN cc ON (a=b) JOIN bb ON (b=coalesce(c,1));
} {1 {ON clause references tables to its right}}
do_catchsql_test 2.2 {
SELECT * FROM aa JOIN cc ON (a=b) JOIN bb ON (b=c);