Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17680#discussion_r116579008
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFilters.scala
---
@@ -235,3 +238,39 @@ private[parquet] object ParquetFilters {
}
}
}
+
+/**
+ * Note that, this is a hacky workaround to allow dots in column names.
Currently, column APIs
+ * in Parquet's `FilterApi` only allows dot-separated names so here we
resemble those columns
+ * but only allow single column path that allows dots in the names as we
don't currently push
+ * down filters with nested fields.
--- End diff --
We need to explain the functions in this object `ParquetColumns` are based
on the codes in `org.apache.parquet.filter2.predicate`. Thus, when upgrading
the Parquet versions, we need to check whether they are still the same.
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