Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21770#discussion_r202562989
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
---
@@ -890,7 +890,7 @@ case class Cast(child: Expression, dataType: DataType,
timeZoneId: Option[String
case StringType =>
val intOpt = ctx.freshName("intOpt")
(c, evPrim, evNull) => s"""
- scala.Option<Integer> $intOpt =
+ scala.Option<Object> $intOpt =
--- End diff --
I don't look into the bytecode that JDK compilers generate though, the type
of the return value seems to be erased in the bytecode;
```
...
/* 045 */ scala.Option<Integer> intOpt_0 =
/* 046 */
org.apache.spark.sql.catalyst.util.DateTimeUtils.stringToDate(((UTF8String)
references[0] /* literal */));
/* 047 */ if (intOpt_0.isDefined()) {
/* 048 */ value_1 = ((Integer) intOpt_0.get()).intValue();
/* 049 */ } else {
/* 050 */ isNull_1 = true;
/* 051 */ }
/* 052 */
...
- Day / DayOfMonth *** FAILED ***
Code generation of dayofmonth(cast(2000-02-29 as date)) failed:
java.util.concurrent.ExecutionException:
org.codehaus.commons.compiler.CompileException: failed to compile:
(Line 67, Column 62) incompatible types: scala.Option<java.lang.Object>
cannot be converted to scala.Option<java.lang.Integer>
java.util.concurrent.ExecutionException:
org.codehaus.commons.compiler.CompileException: failed to compile:
(Line 67, Column 62) incompatible types: scala.Option<java.lang.Object>
cannot be converted to scala.Option<java.lang.Integer>
at
com.google.common.util.concurrent.AbstractFuture$Sync.getValue(AbstractFuture.java:306)
at
com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:293)
at
com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:116)
```
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