Minor Description
This ticket aims at fixing the minor bug that throws an analysis exception when a seed param in `rand`/`randn` having a expr tree (e.g., `rand(1 + 1)`) with constant folding (`ConstantFolding` and `ReorderAssociativeOperator`) disabled. A query to reproduce this issue is as follows;
// v3.1.0, v3.0.2, and v2.4.8 $./bin/spark-shell scala> sql("select rand(1 + 2)").show() +-------------------+ | rand((1 + 2))| +-------------------+ |0.25738143505962285| +-------------------+ $./bin/spark-shell --conf spark.sql.optimizer.excludedRules=org.apache.spark.sql.catalyst.optimizer.ConstantFolding,org.apache.spark.sql.catalyst.optimizer.ReorderAssociativeOperator scala> sql("select rand(1 + 2)").show() org.apache.spark.sql.AnalysisException: Input argument to rand must be an integer, long or null literal.; at org.apache.spark.sql.catalyst.expressions.RDG.seed$lzycompute(randomExpressions.scala:49) at org.apache.spark.sql.catalyst.expressions.RDG.seed(randomExpressions.scala:46) at org.apache.spark.sql.catalyst.expressions.Rand.doGenCode(randomExpressions.scala:98) at org.apache.spark.sql.catalyst.expressions.Expression.$anonfun$genCode$3(Expression.scala:146) at scala.Option.getOrElse(Option.scala:189) ...
A root cause is that the match-case code below cannot handle the case described above:
https://github.com/apache/spark/blob/42f5e62403469cec6da680b9fbedd0aa508dcbe5/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/randomExpressions.scala#L46-L51
