SEPURI-SAI-KRISHNA commented on code in PR #29123:
URL: https://github.com/apache/flink/pull/29123#discussion_r3998626184
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flink-table/flink-table-planner/src/test/scala/org/apache/flink/table/planner/expressions/ScalarFunctionsTest.scala:
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@@ -106,6 +106,26 @@ class ScalarFunctionsTest extends ScalarTypesTestBase {
// invalid length
($"f0".overlay("IS", 6, -1), "OVERLAY(f0 PLACING 'IS' FROM 6 FOR -1)",
"This IS"),
+ // a zero length replaces nothing, so the whole tail survives
+ ("abcdef".overlay("X", 2, 0), "OVERLAY('abcdef' PLACING 'X' FROM 2 FOR
0)", "aXbcdef"),
+ ("abcdef".overlay("X", 1, 0), "OVERLAY('abcdef' PLACING 'X' FROM 1 FOR
0)", "Xabcdef"),
+ ("abcdef".overlay("X", 6, 0), "OVERLAY('abcdef' PLACING 'X' FROM 6 FOR
0)", "abcdeXf"),
+
+ // a supplementary-plane character is one character and is never split
into half a pair
Review Comment:
Added `SqlFunctionUtilsTest` covering both.
Unpaired surrogates are one character each, so `overlay("\ud83d\ud83d", "X",
1, 1)` gives `X\ud83d`. A string of only supplementary characters is
well-formed pairs, also one character each, already covered by the `'😀😀'` case
here.
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