huaxingao commented on pull request #3269:
URL: https://github.com/apache/iceberg/pull/3269#issuecomment-962278737
@wypoon
Are `timestampAsOf` and `versionAsOf` OK for you? I saw the following in
Delta Lake doc:
```
df1 = spark.read.format('delta').option('timestampAsOf',
'2019-01-01').load('/mnt/delta/people-10m')
df2 = spark.read.format('delta').option('versionAsOf',
2).load('/mnt/delta/people-10m')
```
Spark has a very strict control over adding new SQL syntax. Normally only
ANSI standard SQL syntax can be added. I will give it a try and propose adding
`FOR SYSTEM_TIME AS OF` and `FOR SYSTEM_VERSION AS OF` as synonyms.
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