[SPARK-48010] Avoid repeated calls to conf.resolver in resolveExpression

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.3
• Fix Version/s: 4.0.0
• Component/s: SQL
• Labels: pull-request-available
• Assignee: Nikhil Sheoran
• Reporter: Nikhil Sheoran
• Created: 26/Apr/24 16:41
• Updated: 26/Apr/24 18:23
• Resolved: 26/Apr/24 18:23

Description

Consider a view with a large number of columns (~1000s). When resolving this view, looking at the flamegraph, observed repeated initializations of `conf` to obtain the `resolver` for each column of the view.

This can be easily optimized to reuse the same resolver (obtained once) for the various calls to `innerResolve` in `resolveExpression`.

Issue Links

• links to: GitHub Pull Request #46248