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I'm new to bloom indexes and currently my table has 3 partial indexes for the same column in the WHERE clause and with different column combinations for the same table. I was trying to replace them all with 1 bloom index.

However, when I create a bloom index with WHERE clause using below syntax, I get below error:

CREATE EXTENSION bloom;

CREATE INDEX idx_bloom_bar ON message USING bloom  
(s, p, c, m, e, id) 
WHERE (islatest = true)
WITH (length=56, col1=4, col2=4, col3=4, col4=4, col5=4, col6=4);
SQL Error [42601]: ERROR: syntax error at or near "WITH"
Position: 165

However, without WHERE clause, I'm able to create this index successfully.

Please let me know if we can use them as a replacement of multiple partial indexes or not to reduce number of indexes on my table.

  • jjanes clarified the syntax error. I am not convinced that the bloom index beats your current indexing, though. Can you provide your previous indexes and table definition, and rough details of write patterns and relevant cardinalities? – Erwin Brandstetter Jul 9 at 14:36
  • Thanks @ErwinBrandstetter , I can't provide those details here. However, I'm further working on performance analysis/observing changes into the query execution time (after replacing old indexes with bloom) - will share details regarding increase/decrease into overall query execution timings. – Shiwangini Shishulkar Jul 9 at 16:09
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The WITH clause comes before the WHERE clause in the CREATE INDEX syntax. You are not free to rearrange the order as you have attempted here.

This ordering is a little unintuitive to me, but that is how it works.

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