Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18023
@janewangfb If we turn on the flag
`spark.sql.parser.quotedRegexColumnNames` by default, the following test cases
failed. Could you do some investigations? Thanks!
```
org.apache.spark.sql.SQLQuerySuite
org.apache.spark.sql.SingleLevelAggregateHashMapSuite
org.apache.spark.sql.SQLQueryTestSuite
org.apache.spark.sql.sources.TableScanSuite
org.apache.spark.sql.DataFrameAggregateSuite
org.apache.spark.sql.DataFrameSuite
org.apache.spark.sql.DataFrameNaFunctionsSuite
org.apache.spark.sql.TwoLevelAggregateHashMapSuite
org.apache.spark.sql.DatasetSuite
org.apache.spark.sql.execution.datasources.json.JsonSuite
org.apache.spark.sql.DataFrameStatSuite
org.apache.spark.sql.TwoLevelAggregateHashMapWithVectorizedMapSuite
org.apache.spark.sql.execution.datasources.parquet.ParquetFilterSuite
```
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