[HACKERS] ALTER INDEX .. SET STATISTICS ... behaviour

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От Alexander Korotkov
Тема [HACKERS] ALTER INDEX .. SET STATISTICS ... behaviour
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Msg-id CAPpHfdsSYo6xpt0F=ngAdqMPFJJhC7zApde9h1qwkdpHpwFisA@mail.gmail.com
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Ответы Re: [HACKERS] ALTER INDEX .. SET STATISTICS ... behaviour
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Hackers,

I've discovered that PostgreSQL is able to run following kind of queries in order to change statistic-gathering target for an indexed expression.

ALTER INDEX index_name ALTER COLUMN expr SET STATISTICS stat_target;

It's been previously discussed in [1].

I think this should be fixed not just in docs.  This is why I've started thread in pgsql-hackers.  For me usage of internal column names "expr", "expr1", "expr2" etc. looks weird.  And I think we should replace it with a better syntax.  What do you think about these options?

ALTER INDEX index_name ALTER EXPRESSION 0 SET STATISTICS stat_target; -- Refer expression by its number
ALTER INDEX index_name ALTER EXPRESSION (x + y) SET STATISTICS stat_target; -- Refer expression by its definition


------
Alexander Korotkov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company

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