alamb commented on a change in pull request #508:
URL: https://github.com/apache/arrow-datafusion/pull/508#discussion_r647307669
##########
File path: datafusion/src/physical_optimizer/pruning.rs
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@@ -586,8 +587,47 @@ fn build_predicate_expression(
.min_column_expr()?
.lt_eq(expr_builder.scalar_expr().clone())
}
+ Operator::Like => {
+ match &**right {
+ // If the literal is a 'starts_with'
+ Expr::Literal(ScalarValue::Utf8(Some(string)))
+ if !string.starts_with('%') =>
+ {
+ // Split the string to get the first part before '%'
+ let split = string.split('%').next().unwrap().to_string();
Review comment:
I initially wondered the same thing -- lol! But my conclusion was "no it
won't panic"
I made a quick playground that shows this working
https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=049f4c1640386ff99c3b5e07085e0889
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