Minor Description
presently spark sql query for time travel like :
{{SELECT * from {table} TIMESTAMP AS OF 1548751078 }}
works correctly, which is what is specified in sql grammar as well (((FOR SYSTEM_VERSION) | VERSION) AS OF version=(INTEGER_VALUE | STRING)), but when trying to do the same via dataframe option `timestampAsOf` the code fails with :
[info] org.apache.spark.sql.AnalysisException: '1548751078' is not a valid timestamp expression for time travel.
[info] at org.apache.spark.sql.errors.QueryCompilationErrors$.invalidTimestampExprForTimeTravel(QueryCompilationErrors.scala:2413)
[info] at org.apache.spark.sql.catalyst.analysis.TimeTravelSpec$.create(TimeTravelSpec.scala:55)
[info] at org.apache.spark.sql.execution.datasources.v2.DataSourceV2Utils$.loadV2Source(DataSourceV2Utils.scala:128)
[info] at org.apache.spark.sql.DataFrameReader.$anonfun$load$1(DataFrameReader.scala:209)
[info] at scala.Option.flatMap(Option.scala:271)
[info] at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:207)
[info] at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:171)
[info] at org.apache.spark.sql.connector.SupportsCatalogOptionsSuite.load(SupportsCatalogOptionsSuite.scala:365)
[info] at org.apache.spark.sql.connector.SupportsCatalogOptionsSuite.$anonfun$new$33(SupportsCatalogOptionsSuite.scala:329)
[info] at org.apache.spark.sql.QueryTest.checkAnswer(QueryTest.scala:133)
[info] at org.apache.spark.sql.QueryTest.checkAnswer(QueryTest.scala:158)
[info] at org.apache.spark.sql.connector.SupportsCatalogOptionsSuite.$anonfun$new$30(SupportsCatalogOptionsSuite.scala:329)
[info] at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
[info] at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1490)
[info] at org.apache.spark.sql.test.SQLTestUtilsBase.withTable(SQLTestUtils.scala:306)
[info] at org.apache.spark.sql.test.SQLTestUtilsBase.withTable$(SQLTestUtils.scala:304)
[info] at org.apache.spark.sql.connector.SupportsCatalogOptionsSuite.withTable(SupportsCatalogOptionsSuite.scala:44)
[info] at org.apache.spark.sql.connector.SupportsCatalogOptionsSuite.$anonfun$new$26(SupportsCatalogOptionsSuite.scala:309)
[info] at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85)
[info] at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:83)
[info] at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
[info] at org.scalatest.Transformer.apply(Transformer.scala:22)
[info] at org.scalatest.Transformer.apply(Transformer.scala:20)
[info] at org.scalatest.funsuite.AnyFunSuiteLike$$anon$1.apply(AnyFunSuiteLike.scala:190)
[info] at org.apache.spark.SparkFunSuite.withFixture(SparkFunSuite.scala:203)
[info] at org.scalatest.funsuite.AnyFunSuiteLike.invokeWithFixture$1(AnyFunSuiteLike.scala:188)
[info] at org.scalatest.funsuite.AnyFunSuiteLike.$anonfun$runTest$1(AnyFunSuiteLike.scala:200)
[info] at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
[info] at org.scalatest.funsuite.AnyFunSuiteLike.runTest(AnyFunSuiteLike.scala:200)
[info] at org.scalatest.funsuite.AnyFunSuiteLike.runTest$(AnyFunSuiteLike.scala:182)
