[SQL] [Minor] added check analysis rule for union node

[scwf]

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[cloud-fan]

It this logic already in Union.resolved?

[scwf]

aha, yes it is .

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Test build #32782 has started for PR 6174 at commit cf1475a.

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Test build #32782 has finished for PR 6174 at commit cf1475a.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

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[scwf]

seems in hive it allow union's children have diff outputsize
such as

explain 
FROM (select 'tst1' as key, cast(count(1) as string) as value from src s1
                         UNION  ALL  
      select s2.key as key, s2.value as value from src s2) unionsrc
INSERT OVERWRITE TABLE DEST1 SELECT unionsrc.key, COUNT(DISTINCT SUBSTR(unionsrc.value,5)) GROUP BY unionsrc.key
INSERT OVERWRITE TABLE DEST2 SELECT unionsrc.key, unionsrc.value, COUNT(DISTINCT SUBSTR(unionsrc.value,5)) GROUP BY unionsrc.key, unionsrc.value;