jackwener commented on issue #4401:
URL:
https://github.com/apache/arrow-datafusion/issues/4401#issuecomment-1329306081
Look like the rule is right
```
after
"Projection: datetrunc(Utf8("day"),t.column1) AS day
Filter: datetrunc(Utf8("day"),t.column1) IS NOT NULL
Aggregate: groupBy=[[datetrunc(Utf8("day"), t.column1)]], aggr=[[]]
TableScan: t"
before
"Projection: datetrunc(Utf8("day"),t.column1) AS day
Aggregate: groupBy=[[datetrunc(Utf8("day"), t.column1)]], aggr=[[]]
Filter: datetrunc(Utf8("day"),t.column1) IS NOT NULL
TableScan: t projection=[column1]"
```
I think it's caused by that filter can't eval expression
```sql
pg:
-- create
CREATE TABLE t (
column1 TIMESTAMP PRIMARY KEY
);
-- insert
INSERT INTO t VALUES ('2022-11-28T18:00:00');
-- fetch
select * from t where date_trunc('day', column1) is not null;
```
is ok
```sql
CREATE TABLE t AS VALUES (TIMESTAMP '2022-11-28T18:00:00');
select * from t where date_trunc('day', column1) is not null;
```
failed.
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