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Support pruning on string columns using LIKE #507

Description

@nevi-me

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

From looking at the pruning logic, it appears that we can prune inputs based on col = 'string_value', but we can't prune on col LIKE 'value%'.

We should be able to support LIKE and NOT LIKE.

Describe the solution you'd like

Extend the pruning logic to generate a pruning filter for LIKE and NOT LIKE.

Describe alternatives you've considered

None

Additional context

Spark will push down a LIKE filter if it can be converted to a starts_with, normally by checking if the string doesn't start with %.

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