fix typos

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala

@@ -45,6 +45,7 @@ trait Predicate extends Expression {
   override def dataType: DataType = BooleanType
 }
 
+
 trait PredicateHelper {
   protected def splitConjunctivePredicates(condition: Expression): Seq[Expression] = {
     condition match {

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/QueryPlanConstraints.scala

@@ -84,7 +84,7 @@ trait QueryPlanConstraints { self: LogicalPlan =>
    */
   protected def inferIsNotNullConstraints(constraint: Expression): Seq[Expression] =
     constraint match {
-      // When the root is IsNotNull, we can push IsNotNull thro0ugh the child null intolerant
+      // When the root is IsNotNull, we can push IsNotNull through the child null intolerant
       // expressions
       case IsNotNull(expr) => scanNullIntolerantAttribute(expr).map(IsNotNull(_))
       // Constraints always return true for all the inputs. That means, null will never be returned.

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala

@@ -342,11 +342,9 @@ case class Join(
     case _ => resolvedExceptNatural
   }
 
-  /**
-    * Returns additional constraints which are not enforced on the result of join operations, but
-    * which can be enforced either on the left or the right side
-    */
   override protected def constructAllConstraints: Set[Expression] = {
+    // additional constraints which are not enforced on the result of join operations, but can be
+    // enforced either on the left or the right side
     val additionalConstraints = joinType match {
       case LeftAnti | LeftOuter if condition.isDefined =>
         splitConjunctivePredicates(condition.get).flatMap(inferIsNotNullConstraints).filter(