[SPARK-47473][SQL] Fix correctness issue of converting postgres INFIN…

…ITY timestamps

### What changes were proposed in this pull request?

This PR fixes a bug involved with apache#41843 that Epoch Second is used instead of epoch millis to create a timestamp value

### Why are the changes needed?

bugfix
### Does this PR introduce _any_ user-facing change?

no

### How was this patch tested?

revised tests
### Was this patch authored or co-authored using generative AI tooling?

no

Closes apache#45599 from yaooqinn/SPARK-47473.

Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Kent Yao <yao@apache.org>

connector/docker-integration-tests/src/test/scala/org/apache/spark/sql/jdbc/PostgresIntegrationSuite.scala

@@ -20,12 +20,12 @@ package org.apache.spark.sql.jdbc
 import java.math.{BigDecimal => JBigDecimal}
 import java.sql.{Connection, Date, Timestamp}
 import java.text.SimpleDateFormat
-import java.time.{LocalDateTime, ZoneOffset}
+import java.time.LocalDateTime
 import java.util.Properties
 
 import org.apache.spark.sql.{Column, Row}
 import org.apache.spark.sql.catalyst.expressions.Literal
-import org.apache.spark.sql.types.{ArrayType, DecimalType, FloatType, NullType, ShortType}
+import org.apache.spark.sql.types._
 import org.apache.spark.tags.DockerTest
 
 /**
@@ -454,8 +454,8 @@ class PostgresIntegrationSuite extends DockerJDBCIntegrationSuite {
     val negativeInfinity = row(1).getAs[Timestamp]("timestamp_column")
     val infinitySeq = row(0).getAs[scala.collection.Seq[Timestamp]]("timestamp_array")
     val negativeInfinitySeq = row(1).getAs[scala.collection.Seq[Timestamp]]("timestamp_array")
-    val minTimeStamp = LocalDateTime.of(1, 1, 1, 0, 0, 0).toEpochSecond(ZoneOffset.UTC)
-    val maxTimestamp = LocalDateTime.of(9999, 12, 31, 23, 59, 59).toEpochSecond(ZoneOffset.UTC)
+    val minTimeStamp = -62135596800000L
+    val maxTimestamp = 253402300799999L
     assert(infinity.getTime == maxTimestamp)
     assert(negativeInfinity.getTime == minTimeStamp)
     assert(infinitySeq.head.getTime == maxTimestamp)

sql/core/src/main/scala/org/apache/spark/sql/jdbc/PostgresDialect.scala

@@ -312,8 +312,9 @@ private object PostgresDialect extends JdbcDialect with SQLConfHelper {
     val POSTGRESQL_DATE_POSITIVE_INFINITY = 9223372036825200000L
     val POSTGRESQL_DATE_DATE_POSITIVE_SMALLER_INFINITY = 185543533774800000L
 
-    val minTimeStamp = LocalDateTime.of(1, 1, 1, 0, 0, 0).toEpochSecond(ZoneOffset.UTC)
-    val maxTimestamp = LocalDateTime.of(9999, 12, 31, 23, 59, 59).toEpochSecond(ZoneOffset.UTC)
+    val minTimeStamp = LocalDateTime.of(1, 1, 1, 0, 0, 0).toInstant(ZoneOffset.UTC).toEpochMilli
+    val maxTimestamp =
+      LocalDateTime.of(9999, 12, 31, 23, 59, 59, 999999999).toInstant(ZoneOffset.UTC).toEpochMilli
 
     val time = t.getTime
     if (time == POSTGRESQL_DATE_POSITIVE_INFINITY ||