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Enhance EXPLAIN QUERY PLAN to report the generation of constant rows using

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VALUES or just a SELECT without FROM.

FossilOrigin-Name: c75eee69fa8a9b56ee58a4cc539e80cc982f43390dc3a357344d58479dd89a41
This commit is contained in:
drh
2018-05-03 01:37:13 +00:00
parent cdf88760da
commit fa16f5d9d6
8 changed files with 35 additions and 25 deletions
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6
test/eqp.test
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@ -89,6 +89,7 @@ do_eqp_test 1.7 {
} {
QUERY PLAN
|--MATERIALIZE xxxxxx
| `--SCAN CONSTANT ROW
|--SCAN SUBQUERY xxxxxx
`--SCAN TABLE t3
}
@ -99,7 +100,9 @@ do_eqp_test 1.8 {
|--MATERIALIZE xxxxxx
| `--COMPOUND QUERY
| |--LEFT-MOST SUBQUERY
| | `--SCAN CONSTANT ROW
| `--UNION USING TEMP B-TREE
| `--SCAN CONSTANT ROW
|--SCAN SUBQUERY xxxxxx
`--SCAN TABLE t3
}
@ -110,6 +113,7 @@ do_eqp_test 1.9 {
|--MATERIALIZE xxxxxx
| `--COMPOUND QUERY
| |--LEFT-MOST SUBQUERY
| | `--SCAN CONSTANT ROW
| `--EXCEPT USING TEMP B-TREE
| `--SCAN TABLE t3
|--SCAN SUBQUERY xxxxxx
@ -122,6 +126,7 @@ do_eqp_test 1.10 {
|--MATERIALIZE xxxxxx
| `--COMPOUND QUERY
| |--LEFT-MOST SUBQUERY
| | `--SCAN CONSTANT ROW
| `--INTERSECT USING TEMP B-TREE
| `--SCAN TABLE t3
|--SCAN SUBQUERY xxxxxx
@ -135,6 +140,7 @@ do_eqp_test 1.11 {
|--MATERIALIZE xxxxxx
| `--COMPOUND QUERY
| |--LEFT-MOST SUBQUERY
| | `--SCAN CONSTANT ROW
| `--UNION ALL
| `--SCAN TABLE t3
|--SCAN SUBQUERY xxxxxx