hulincup commented on code in PR #28931:
URL: https://github.com/apache/flink/pull/28931#discussion_r3755725017
##########
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/functions/StringFunctionsITCase.java:
##########
@@ -182,6 +186,26 @@ private Stream<TestSetSpec> eltTestCases() {
DataTypes.VARCHAR(5))
.testResult(
lit(2).elt("a", "b"), "ELT(2, 'a', 'b')", "b",
DataTypes.CHAR(1))
+ .testResult(
+ lit(2).cast(DataTypes.TINYINT()).elt("scala",
"java"),
+ "ELT(CAST(2 AS TINYINT), 'scala', 'java')",
+ "java",
+ DataTypes.VARCHAR(5))
+ .testResult(
+ $("f4").elt("scala", "java"),
+ "ELT(f4, 'scala', 'java')",
+ "java",
+ DataTypes.VARCHAR(5))
+ .testResult(
Review Comment:
Added in a4e350f — `$("f4").elt($("f3"), $("f2"))`: f4 is a non-literal
TINYINT index (the codegen path), f2 holds null BYTES data at the selected
position, so the result is null.
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