wangyum opened a new pull request #29728: URL: https://github.com/apache/spark/pull/29728
### What changes were proposed in this pull request? This pr prohibit binary comparisons chain. ### Why are the changes needed? 1. There are potential issues in enabling the binary comparison chain. Wrong SQL written by users will affect the stability of the entire thrift server because of Spark sql will use `BroadcastNestedLoopJoin `. This is a real case:  2. Most SQL engine do not support ``` postgres=# create table t3(a int, b int, c int); CREATE TABLE postgres=# select * from t3 where a = b =c; ERROR: syntax error at or near "=" ``` ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? Unit test. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
