StanZhai created SPARK-19472:
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Summary: [SQL]SQLParser fails to resolve nested CASE WHEN
statement with parentheses
Key: SPARK-19472
URL: https://issues.apache.org/jira/browse/SPARK-19472
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.1.0
Reporter: StanZhai
SQLParser fails to resolve nested CASE WHEN statement like this:
select case when
(1) +
case when 1>0 then 1 else 0 end = 2
then 1 else 0 end
from tb
==================== Exception ====================
Exception in thread "main" org.apache.spark.sql.catalyst.parser.ParseException:
mismatched input 'then' expecting {'.', '[', 'OR', 'AND', 'IN', NOT, 'BETWEEN',
'LIKE', RLIKE, 'IS', 'WHEN', EQ, '<=>', '<>', '!=', '<', LTE, '>', GTE, '+',
'-', '*', '/', '%', 'DIV', '&', '|', '^'}(line 5, pos 0)
== SQL ==
select case when
(1) +
case when 1>0 then 1 else 0 end = 2
then 1 else 0 end
^^^
from tb
But，remove parentheses will be fine：
select case when
1 +
case when 1>0 then 1 else 0 end = 2
then 1 else 0 end
from tb
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