Simon Charette 405c836336 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.

2019-04-23 08:11:33 +02:00

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