Github user janewangfb commented on a diff in the pull request:
https://github.com/apache/spark/pull/18023#discussion_r125728877
--- 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 --
we should only support select. It does not make sense to do select a from
test where `(a)?+.+`=3.
Also, for hive
(https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select), it
only supports the select statements:
"REGEX Column Specification
A SELECT statement can take regex-based column specification in Hive
releases prior to 0.13.0, or in 0.13.0 and later releases if the configuration
property hive.support.quoted.identifiers is set to none."
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