Re: [EXTERNAL] Re: BUG #16835: btree index does not work for where clause using 'foo%'

Thanks, Luis

From: "luis(dot)roberto(at)siscobra(dot)com(dot)br" <luis(dot)roberto(at)siscobra(dot)com(dot)br>
Date: Friday, January 22, 2021 at 1:28 PM
To: "Zhang, Hongyan" <ZhangH3(at)aetna(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-bugs <pgsql-bugs(at)lists(dot)postgresql(dot)org>
Subject: Re: [EXTERNAL] Re: BUG #16835: btree index does not work for where clause using 'foo%'

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De: "Zhang, Hongyan" <ZhangH3(at)aetna(dot)com>
Para: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "pgsql-bugs" <pgsql-bugs(at)lists(dot)postgresql(dot)org>
Enviadas: Sexta-feira, 22 de janeiro de 2021 16:07:22
Assunto: Re: [EXTERNAL] Re: BUG #16835: btree index does not work for where clause using 'foo%'

Thanks, Tom.
Locale is en_US.UTF-8.

Is there plan to alter that behavior to allow index in non C locale?

According to documentation: "However, if your database does not use the C locale you will need to create the index with a special operator class to support indexing of pattern-matching queries;"

So you'll have to create the index with a specific operator class.

You can use:.

CREATE INDEX tbl_col_text_pattern_ops_idx ON tbl(col text_pattern_ops) [1]

[1] https://stackoverflow.com/questions/1566717/postgresql-like-query-performance-variations<https://stackoverflow.com/questions/1566717/postgresql-like-query-performance-variations>

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Thank you. Aetna