[MINOR] Fix Typos 'an -> a'

## What changes were proposed in this pull request?

`an -> a`

Use cmds like `find . -name '*.R' | xargs -i sh -c "grep -in ' an [^aeiou]' {} && echo {}"` to generate candidates, and review them one by one.

## How was this patch tested?
manual tests

Author: Zheng RuiFeng <ruifengz@foxmail.com>

Closes #13515 from zhengruifeng/an_a.

10 files changed, 14 insertions, 14 deletions

diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/Row.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/Row.scala
index 391001de26..d83eef7a41 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/Row.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/Row.scala
@@ -300,7 +300,7 @@ trait Row extends Serializable {
     getMap[K, V](i).asJava
 
   /**
-   * Returns the value at position i of struct type as an [[Row]] object.
+   * Returns the value at position i of struct type as a [[Row]] object.
    *
    * @throws ClassCastException when data type does not match.
    */
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
index 0e68656467..d1ca99f79e 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
@@ -37,7 +37,7 @@ import org.apache.spark.sql.catalyst.util.toPrettySQL
 import org.apache.spark.sql.types._
 
 /**
- * A trivial [[Analyzer]] with an dummy [[SessionCatalog]] and [[EmptyFunctionRegistry]].
+ * A trivial [[Analyzer]] with a dummy [[SessionCatalog]] and [[EmptyFunctionRegistry]].
  * Used for testing when all relations are already filled in and the analyzer needs only
  * to resolve attribute references.
  */
@@ -1496,7 +1496,7 @@ class Analyzer(
    * This rule handles three cases:
    *  - A [[Project]] having [[WindowExpression]]s in its projectList;
    *  - An [[Aggregate]] having [[WindowExpression]]s in its aggregateExpressions.
-   *  - An [[Filter]]->[[Aggregate]] pattern representing GROUP BY with a HAVING
+   *  - A [[Filter]]->[[Aggregate]] pattern representing GROUP BY with a HAVING
    *    clause and the [[Aggregate]] has [[WindowExpression]]s in its aggregateExpressions.
    * Note: If there is a GROUP BY clause in the query, aggregations and corresponding
    * filters (expressions in the HAVING clause) should be evaluated before any
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
index eca837ccf0..a7388c71de 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
@@ -410,7 +410,7 @@ object FunctionRegistry {
           case Failure(e) => throw new AnalysisException(e.getMessage)
         }
       } else {
-        // Otherwise, find an ctor method that matches the number of arguments, and use that.
+        // Otherwise, find a constructor method that matches the number of arguments, and use that.
         val params = Seq.fill(expressions.size)(classOf[Expression])
         val f = Try(tag.runtimeClass.getDeclaredConstructor(params : _*)) match {
           case Success(e) =>
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/MultiInstanceRelation.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/MultiInstanceRelation.scala
index 394be47a58..95a3837ae1 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/MultiInstanceRelation.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/MultiInstanceRelation.scala
@@ -20,7 +20,7 @@ package org.apache.spark.sql.catalyst.analysis
 import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
 
 /**
- * A trait that should be mixed into query operators where an single instance might appear multiple
+ * A trait that should be mixed into query operators where a single instance might appear multiple
  * times in a logical query plan.  It is invalid to have multiple copies of the same attribute
  * produced by distinct operators in a query tree as this breaks the guarantee that expression
  * ids, which are used to differentiate attributes, are unique.
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
index 371c198aa3..943d1071e2 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
@@ -241,7 +241,7 @@ class SessionCatalog(
   /**
    * Retrieve the metadata of an existing metastore table.
    * If no database is specified, assume the table is in the current database.
-   * If the specified table is not found in the database then an [[NoSuchTableException]] is thrown.
+   * If the specified table is not found in the database then a [[NoSuchTableException]] is thrown.
    */
   def getTableMetadata(name: TableIdentifier): CatalogTable = {
     val db = formatDatabaseName(name.database.getOrElse(getCurrentDatabase))
@@ -266,7 +266,7 @@ class SessionCatalog(
   /**
    * Load files stored in given path into an existing metastore table.
    * If no database is specified, assume the table is in the current database.
-   * If the specified table is not found in the database then an [[NoSuchTableException]] is thrown.
+   * If the specified table is not found in the database then a [[NoSuchTableException]] is thrown.
    */
   def loadTable(
       name: TableIdentifier,
@@ -283,7 +283,7 @@ class SessionCatalog(
   /**
    * Load files stored in given path into the partition of an existing metastore table.
    * If no database is specified, assume the table is in the current database.
-   * If the specified table is not found in the database then an [[NoSuchTableException]] is thrown.
+   * If the specified table is not found in the database then a [[NoSuchTableException]] is thrown.
    */
   def loadPartition(
       name: TableIdentifier,
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/functionResources.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/functionResources.scala
index c66d08d2cf..8e46b962ff 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/functionResources.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/functionResources.scala
@@ -19,7 +19,7 @@ package org.apache.spark.sql.catalyst.catalog
 
 import org.apache.spark.sql.AnalysisException
 
-/** An trait that represents the type of a resourced needed by a function. */
+/** A trait that represents the type of a resourced needed by a function. */
 abstract class FunctionResourceType(val resourceType: String)
 
 object JarResource extends FunctionResourceType("jar")
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ExpectsInputTypes.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ExpectsInputTypes.scala
index b3dfac806f..c15a2df508 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ExpectsInputTypes.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ExpectsInputTypes.scala
@@ -21,7 +21,7 @@ import org.apache.spark.sql.catalyst.analysis.TypeCheckResult
 import org.apache.spark.sql.types.AbstractDataType
 
 /**
- * An trait that gets mixin to define the expected input types of an expression.
+ * A trait that gets mixin to define the expected input types of an expression.
  *
  * This trait is typically used by operator expressions (e.g. [[Add]], [[Subtract]]) to define
  * expected input types without any implicit casting.
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Projection.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Projection.scala
index 27ad8e4cf2..c8d18667f7 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Projection.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Projection.scala
@@ -158,7 +158,7 @@ object UnsafeProjection {
 object FromUnsafeProjection {
 
   /**
-   * Returns an Projection for given StructType.
+   * Returns a Projection for given StructType.
    */
   def apply(schema: StructType): Projection = {
     apply(schema.fields.map(_.dataType))
@@ -172,7 +172,7 @@ object FromUnsafeProjection {
   }
 
   /**
-   * Returns an Projection for given sequence of Expressions (bounded).
+   * Returns a Projection for given sequence of Expressions (bounded).
    */
   private def create(exprs: Seq[Expression]): Projection = {
     GenerateSafeProjection.generate(exprs)
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
index f60d278c54..d603d3c73e 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
@@ -91,7 +91,7 @@ case class CreateMap(children: Seq[Expression]) extends Expression {
 
   override def checkInputDataTypes(): TypeCheckResult = {
     if (children.size % 2 != 0) {
-      TypeCheckResult.TypeCheckFailure(s"$prettyName expects an positive even number of arguments.")
+      TypeCheckResult.TypeCheckFailure(s"$prettyName expects a positive even number of arguments.")
     } else if (keys.map(_.dataType).distinct.length > 1) {
       TypeCheckResult.TypeCheckFailure("The given keys of function map should all be the same " +
         "type, but they are " + keys.map(_.dataType.simpleString).mkString("[", ", ", "]"))
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/types/AbstractDataType.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/types/AbstractDataType.scala
index 03ea349221..65eae869d4 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/types/AbstractDataType.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/types/AbstractDataType.scala
@@ -148,7 +148,7 @@ abstract class NumericType extends AtomicType {
   // implicitly[Numeric[JvmType]] to be valid, we have to change JvmType from a type variable to a
   // type parameter and add a numeric annotation (i.e., [JvmType : Numeric]). This gets
   // desugared by the compiler into an argument to the objects constructor. This means there is no
-  // longer an no argument constructor and thus the JVM cannot serialize the object anymore.
+  // longer a no argument constructor and thus the JVM cannot serialize the object anymore.
   private[sql] val numeric: Numeric[InternalType]
 }