Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/18023#discussion_r126079978 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala --- @@ -847,6 +847,12 @@ object SQLConf { .intConf .createWithDefault(UnsafeExternalSorter.DEFAULT_NUM_ELEMENTS_FOR_SPILL_THRESHOLD.toInt) + val SUPPORT_QUOTED_REGEX_COLUMN_NAME = buildConf("spark.sql.parser.quotedRegexColumnNames") + .doc("When true, quoted Identifiers (using backticks) in SELECT statement are interpreted" + --- End diff -- I agree. It only makes sense when we use it in SELECT statement. However, our parser allows `quoted Identifiers (using backticks)` in any part of the SQL statement. Below is the just the example. If we turn on this conf flag, will it cause the problem for the other users when they have quoted identifiers in the query except Project/SELECT list?
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