vineetgarg02 commented on a change in pull request #1315:
URL: https://github.com/apache/hive/pull/1315#discussion_r466533366
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File path: ql/src/test/results/clientpositive/llap/udf_greatest.q.out
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@@ -63,7 +63,7 @@ STAGE PLANS:
alias: src
Row Limit Per Split: 1
Select Operator
- expressions: 'c' (type: string), 'a' (type: string), 'AaA' (type:
string), 'AAA' (type: string), '13' (type: string), '2' (type: string), '03'
(type: string), '1' (type: string), null (type: double), null (type: double),
null (type: double), null (type: double), null (type: double), null (type:
double)
Review comment:
There is a small change in the patch which updates the type inference
rule for void/null. Prior to the change the expressions were being inferred as
`Double` in this case. With the change it is appropriately inferred as `String`
(since rest of the expressions within this UDF (`GREATEST('a', 'b', null )`) is
interpreted as string.
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