[SPARK-3010] fix redundant conditional in spark #1923
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https://issues.apache.org/jira/browse/SPARK-3010
there are some redundant conditional in spark, such as
1.
private[spark] def codegenEnabled: Boolean =
if (getConf(CODEGEN_ENABLED, "false") == "true") true else false
2.
x => if (x == 2) true else false
...
this pr is to fix this