Обсуждение: Text,Citext column and Btree index

Hi,
Why is a citext column not using Btree index for like operation even without
any wildcard character? It can use Btree index if there is no wildcard
character and if it is at the end right?
Also a text column is using index when there is no wildcard character,but it
is also not using if it is present at the end.



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On 09/01/2016 09:34 AM, Viswanath wrote:
> Hi,
> Why is a citext column not using Btree index for like operation even without
> any wildcard character?

Because it doesn't know how.

> It can use Btree index if there is no wildcard character and if it is at the end right?

No; use pg_trgm for this.

> Also a text column is using index when there is no wildcard character,but it
> is also not using if it is present at the end.

Did you declare your index with text_pattern_ops?
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Vik Fearing                                          +33 6 46 75 15 36
http://2ndQuadrant.fr     PostgreSQL : Expertise, Formation et Support