Github user viirya commented on the issue:
https://github.com/apache/spark/pull/15807
E.g.,
if (isNull(subexpr)) {
...
} else {
AssertNotNull(subexpr) // subexpr2, first used.
....
SomeExpr(AssertNotNull(subexpr)) // SomeExpr(subexpr2)
}
if (isNull(subexpr)) {
...
} else {
AssertNotNull(subexpr) // subexpr2
....
SomeExpr2(AssertNotNull(subexpr)) // SomeExpr2(subexpr2)
}
SomeExpr3(AssertNotNull(subexpr)) // SomeExpr3(subexpr2)
`AssertNotNull(subexpr)` is recognized as subexpression. When it is used in
the else branch at the top, it is evaluated in this branch. But
`SomeExpr3(AssertNotNull(subexpr))` which also uses it can't access the
evaluated subexpression result.
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