cwq222 opened a new issue, #13318:
URL: https://github.com/apache/gravitino/issues/13318
### What would you like to be improved?
ClickHouse's `PARTITION BY` accepts arbitrary expressions. A common valid
pattern is a nested type conversion such as `toYYYYMM(toDate(event_time))`,
which means "convert `event_time` to Date, then take the year-month"; the
actual partition column is `event_time` at month granularity.
Currently (after PR #13080), such a partition key is loaded with an empty
`partitioning()` and the canonical expression is preserved verbatim in the
read-only `partition-key` property. It would be better to extract the inner
column and expose a structured transform, e.g. `toYYYYMM(toDate(event_time))`
-> `month("event_time")`.
### How should we improve?
Transparently extract the inner column from nested type-conversion functions
so that the partition key can be structured, e.g.
`toYYYYMM(toDate(event_time))` -> `month("event_time")`. The detailed scope and
semantic contract can be discussed later.
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