findepi commented on code in PR #12978:
URL: https://github.com/apache/datafusion/pull/12978#discussion_r1823893452
##########
datafusion/core/src/physical_optimizer/pruning.rs:
##########
@@ -1610,6 +1629,126 @@ fn build_statistics_expr(
Ok(statistics_expr)
}
+fn build_like_match(
+ expr_builder: &mut PruningExpressionBuilder,
+) -> Option<Arc<dyn PhysicalExpr>> {
+ // column LIKE literal => (min, max) LIKE literal split at % => min <=
split literal && split literal <= max
+ // column LIKE 'foo%' => min <= 'foo' && 'foo' <= max
+ // column LIKE '%foo' => min <= '' && '' <= max => true
+ // column LIKE '%foo%' => min <= '' && '' <= max => true
+ // column LIKE 'foo' => min <= 'foo' && 'foo' <= max
Review Comment:
in https://github.com/apache/datafusion/pull/12978#discussion_r1819023885 it
was proposed to reword this and make a function doc comment.
If you want to keep as is, please make sure `=>` for implication and those
comparisons can be easily read - maybe add braces?
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