Dandandan commented on a change in pull request #508:
URL: https://github.com/apache/arrow-datafusion/pull/508#discussion_r645991369
##########
File path: datafusion/src/physical_optimizer/pruning.rs
##########
@@ -586,8 +587,45 @@ 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('%') =>
+ {
+ let scalar_expr =
+
Expr::Literal(ScalarValue::Utf8(Some(string.replace('%', ""))));
+ // Behaves like Eq
+ let min_column_expr = expr_builder.min_column_expr()?;
+ let max_column_expr = expr_builder.max_column_expr()?;
+ min_column_expr
+ .lt_eq(scalar_expr.clone())
+ .and(scalar_expr.lt_eq(max_column_expr))
+ }
+ _ => unhandled,
+ }
+ }
+ Operator::NotLike => {
+ match &**right {
+ // If the literal is a 'starts_with'
+ Expr::Literal(ScalarValue::Utf8(Some(string)))
+ if !string.starts_with('%') =>
Review comment:
I think as we can evaluate the like expression anyway, it might be
easier to support like / not like to the full extent instead of only
"startswith".
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
