Hello!
I have following table:
CREATE TABLE table1 (
field1 INTEGER NOT NULL,
field2 INTEGER NOT NULL,
field3 CHARACTER(30),
... some more numeric fields)
I have also those indexes:
CREATE UNIQUE INDEX idx1 ON table1 USING btree (field3, field2, field1)
CREATE INDEX idx2 ON table1 USING btree (field1, field3)
Then I query this table with something like this:
SELECT SUM(...) FROM table1 WHERE field3 = 'ABC' AND field1 <> 1
GROUP BY field2
And planner picks up a sequential scan of a table. Why does he?
--
A: Because it messes up the order in which people normally read text.
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