houqp commented on a change in pull request #605:
URL: https://github.com/apache/arrow-datafusion/pull/605#discussion_r663445568
##########
File path: datafusion/src/logical_plan/expr.rs
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@@ -1118,36 +1133,56 @@ pub fn columnize_expr(e: Expr, input_schema: &DFSchema)
-> Expr {
}
}
+/// Recursively replace all Column expressions in a given expression tree with
Column expressions
+/// provided by the hash map argument.
+pub fn replace_col(e: Expr, replace_map: &HashMap<&Column, &Column>) ->
Result<Expr> {
Review comment:
this is used in predicate push down optimizer to push predicates to both
sides of the join clause.
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