[Spark][3.2] Fix CommitInfo.inCommitTimestamp deserialization for ver…

…y small timestamps (#3045)

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## Description

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Currently, if we deserialize a CommitInfo with a very small
inCommitTimestamp and then try to access this inCommitTimestamp, this
exception is thrown

```
java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.Long
```
This PR fixes the CommitInfo so that the inCommitTimestamp field is
deserialized correctly.

## How was this patch tested?

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Added a new test case that was failing before the fix.

## Does this PR introduce _any_ user-facing changes?

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No

spark/src/main/scala/org/apache/spark/sql/delta/actions/actions.scala

@@ -1077,6 +1077,7 @@ case class CommitInfo(
     // infer the commit version from the file name and fill in this field then.
     @JsonDeserialize(contentAs = classOf[java.lang.Long])
     version: Option[Long],
+    @JsonDeserialize(contentAs = classOf[java.lang.Long])
     inCommitTimestamp: Option[Long],
     timestamp: Timestamp,
     userId: Option[String],

spark/src/test/scala/org/apache/spark/sql/delta/ActionSerializerSuite.scala

@@ -185,6 +185,25 @@ class ActionSerializerSuite extends QueryTest with SharedSparkSession with Delta
     assert(Action.fromJson(json1) === expectedCommitInfo)
   }
 
+  test("deserialization of CommitInfo with a very small ICT") {
+    val json1 =
+      """{"commitInfo":{"inCommitTimestamp":123,"timestamp":123,"operation":"CONVERT",""" +
+        """"operationParameters":{},"readVersion":23,""" +
+        """"isolationLevel":"SnapshotIsolation","isBlindAppend":true,""" +
+        """"operationMetrics":{"m1":"v1","m2":"v2"},"userMetadata":"123"}}""".stripMargin
+    assert(Action.fromJson(json1).asInstanceOf[CommitInfo].inCommitTimestamp.get == 123L)
+  }
+
+  test("deserialization of CommitInfo with missing ICT") {
+    val json1 =
+      """{"commitInfo":{"timestamp":123,"operation":"CONVERT",""" +
+        """"operationParameters":{},"readVersion":23,""" +
+        """"isolationLevel":"SnapshotIsolation","isBlindAppend":true,""" +
+        """"operationMetrics":{"m1":"v1","m2":"v2"},"userMetadata":"123"}}""".stripMargin
+    val ictOpt: Option[Long] = Action.fromJson(json1).asInstanceOf[CommitInfo].inCommitTimestamp
+    assert(ictOpt.isEmpty)
+  }
+
   testActionSerDe(
     "Protocol - json serialization/deserialization",
     Protocol(minReaderVersion = 1, minWriterVersion = 2),