dongjoon-hyun edited a comment on issue #24881: [SPARK-23160][SQL][TEST] Port 
window.sql
URL: https://github.com/apache/spark/pull/24881#issuecomment-514690483
 
 
   SQL Function and SQL Language syntax is different, @DylanGuedes .
   1. The one you mention 
[here](https://github.com/apache/spark/pull/24881#issuecomment-514606530) is 
higher-order function, `filter`. And, you need to search Apache Spark SQL 
function API document.
      - https://spark.apache.org/docs/latest/api/sql/#filter
   2. The one you asked is SQL syntax, `FILTER (WHERE ...)`. And,  you need to 
search SQL Standard Documentation. (Not Apache Spark SQL document).
      - But, you don't need to search this. Filing a JIRA and adding comment is 
enough because we already know (1) and (2) is not the same one.
   

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