Yijie Shen created FLINK-3723:
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Summary: Aggregate Functions and scalar expressions shouldn't be
mixed in select
Key: FLINK-3723
URL: https://issues.apache.org/jira/browse/FLINK-3723
Project: Flink
Issue Type: Improvement
Components: Table API
Affects Versions: 1.0.1
Reporter: Yijie Shen
When we type {code}select deptno, name, max(age) from dept group by
deptno;{code} in calcite or Oracle, it will complain {code}Expression 'NAME' is
not being grouped{code} or {code}Column 'dept.name' is invalid in the select
list because it is not contained in either an aggregate function or the GROUP
BY clause.{code} because of the nondeterministic result.
Therefore, I suggest to separate the current functionality of `select` into two
api, the new `select` only handle scalar expressions, and an `agg` accept
Aggregates.
{code}
def select(exprs: Expression*)
def agg(aggs: Aggregation*)
{code}
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