jkosh44 commented on issue #14633:
URL: https://github.com/apache/datafusion/issues/14633#issuecomment-2656884987

   As an aside, it looks like the PostgreSQL dialect and actual PostgreSQL have 
different behaviors w.r.t. a dangling `FILTER` clause.
   
   ```
   DataFusion CLI v45.0.0
   > SET datafusion.sql_parser.dialect = 'PostgreSQL';
   0 row(s) fetched. 
   Elapsed 0.002 seconds.
   
   > CREATE TABLE t (a INT);
   0 row(s) fetched. 
   Elapsed 0.006 seconds.
   
   > SELECT SUM(a) FILTER FROM t;
   +----------+
   | sum(t.a) |
   +----------+
   | NULL     |
   +----------+
   1 row(s) fetched. 
   Elapsed 0.006 seconds.
   
   ```
   
   ```
   psql (17.2 (Ubuntu 17.2-1.pgdg24.04+1))
   SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, 
compression: off, ALPN: postgresql)
   Type "help" for help.
   
   postgres=# CREATE TEMP TABLE t (a INT);
   CREATE TABLE
   postgres=# SELECT SUM(a) FILTER FROM t;
   ERROR:  syntax error at or near "FROM"
   LINE 1: SELECT SUM(a) FILTER FROM t;
                                ^
   postgres=# 
   
   ```


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