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Simon Charette 88bf635c35 [2.2.x] Fixed #30385 -- Restored SearchVector(config) immutability.
Regression in 1a28dc3887.

The usage of CONCAT to allow SearchVector to deal with non-text fields
made the generated expression non-IMMUTABLE which prevents a functional
index to be created for it.

Using a combination of COALESCE and ::text makes sure the expression
preserves its immutability.

Refs #29582. Thanks Andrew Brown for the report, Nick Pope for the
review.

Backport of 405c836336 from master
2019-04-23 08:32:36 +02:00
..