lvheyang commented on issue #723:
URL:
https://github.com/apache/arrow-datafusion/issues/723#issuecomment-883007802
> 2. Limit to pruning simple expressions
To accomplish this target, I plan to limit pruning only to such simple
expressions
1. column with boolean type
2. simple arithmetic (`+ - * /`) and comparison (`> = < >= <= !=`)
expression, before we generating predicate, we should normalize the expression
to such form:
* left(col) compare right(literal expression)
3. compound logical relation (and or not), may consist of one or many
expressions
which we may not support by now:
1. scalar functions act on columns
2. expressions with 2 or more columns
This plan is the final version, it would be changed. If there is any
problem, we can discuss it here or on the PR page.
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