dbtsai commented on a change in pull request #27817: [SPARK-31060][SQL] Handle
column names containing `dots` in data source `Filter`
URL: https://github.com/apache/spark/pull/27817#discussion_r389503571
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/sources/filters.scala
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@@ -32,6 +32,7 @@ import org.apache.spark.annotation.{Evolving, Stable}
sealed abstract class Filter {
/**
* List of columns that are referenced by this filter.
+ * Note that, if a column contains `dots` in name, it will be quoted to
avoid confusion.
Review comment:
When there is a `dot` in the column name, the existing `Filter` will not
quote it. As a result, to extend it to support nested column, we need to quote
the `dot` in name to distinguish from the `dot` as a separator of nested column.
The behavior change is only for the column name that contains `dot`.
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