a148f8bc04
This fills in some gaps in planner support for starts_with() and the equivalent ^@ operator: * A condition such as "textcol ^@ constant" can now use a regular btree index, not only an SP-GiST index, so long as the index's collation is C. (This works just like "textcol LIKE 'foo%'".) * "starts_with(textcol, constant)" can be optimized the same as "textcol ^@ constant". * Fixed-prefix LIKE and regex patterns are now more like starts_with() in another way: if you apply one to an SPGiST-indexed column, you'll get an index condition using ^@ rather than two index conditions with >= and <. Per a complaint from Shay Rojansky. Patch by me; thanks to Nathan Bossart for review. Discussion: https://postgr.es/m/232599.1633800229@sss.pgh.pa.us
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