Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/10502#discussion_r48590599
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFilters.scala
---
@@ -208,11 +210,30 @@ private[sql] object ParquetFilters {
}
/**
+ * Return referenced columns in [[sources.Filter]].
+ */
+ def referencedColumns(schema: StructType, predicate: sources.Filter):
Array[String] = {
--- End diff --
Oh, yes it looks so. I think I might also have to change `createFilter()`
in that way because I just followed up in the way of `createFilter()` for this
function because both `createFilter()` and `referencedColumns()` are called in
the same places.
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