fix comments about naming

Author: wangzhenhua

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala

@@ -444,10 +444,10 @@ object QueryPlan extends PredicateHelper {
   }
 
   /** Normalize and reorder the expressions in the given sequence. */
-  def canonicalizeExprSeq(exprSeq: Seq[Expression], output: AttributeSeq): Seq[Expression] = {
-    if (exprSeq.nonEmpty) {
-      val normalizedExprs = QueryPlan.normalizeExprId(exprSeq.reduce(And), output)
-      splitConjunctivePredicates(normalizedExprs)
+  def normalizePredicates(predicates: Seq[Expression], output: AttributeSeq): Seq[Expression] = {
+    if (predicates.nonEmpty) {
+      val normalized = normalizeExprId(predicates.reduce(And), output)
+      splitConjunctivePredicates(normalized)
     } else {
       Nil
     }

sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala

@@ -519,8 +519,8 @@ case class FileSourceScanExec(
       relation,
       output.map(QueryPlan.normalizeExprId(_, output)),
       requiredSchema,
-      QueryPlan.canonicalizeExprSeq(partitionFilters, output),
-      QueryPlan.canonicalizeExprSeq(dataFilters, output),
+      QueryPlan.normalizePredicates(partitionFilters, output),
+      QueryPlan.normalizePredicates(dataFilters, output),
       None)
   }
 }

sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/HiveTableScanExec.scala

@@ -206,7 +206,7 @@ case class HiveTableScanExec(
     HiveTableScanExec(
       requestedAttributes.map(QueryPlan.normalizeExprId(_, input)),
       relation.canonicalized.asInstanceOf[CatalogRelation],
-      QueryPlan.canonicalizeExprSeq(partitionPruningPred, input))(sparkSession)
+      QueryPlan.normalizePredicates(partitionPruningPred, input))(sparkSession)
   }
 
   override def otherCopyArgs: Seq[AnyRef] = Seq(sparkSession)