Hello

PI >  change your query a bit when you use bitwise operations, in your case 
when you
PI > have 'AND col_c&32' you may add 'AND col_c>=32'. now index will be used

PI col_c = 64 does pass second condition and doesn't pass first one. ;-) 
PI Bitwise operators cannot be changed so easily to inequalities.

Wasn't the idea that the index would get used for the equality test, and 
the more expensive bitwise comparison would then be run on a smaller 
number of rows?

I don't know if this is possible. But that is how I imagined the 
suggestion.

Swithun.
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