[HUDI-2642] Add support ignoring case in update sql operation (#3882)

hudi-spark-datasource/hudi-spark/src/main/scala/org/apache/spark/sql/hudi/command/UpdateHoodieTableCommand.scala

@@ -51,7 +51,10 @@ case class UpdateHoodieTableCommand(updateTable: UpdateTable) extends RunnableCo
     }.toMap
 
     val updateExpressions = table.output
-      .map(attr => name2UpdateValue.getOrElse(attr.name, attr))
+      .map(attr => {
+        val UpdateValueOption = name2UpdateValue.find(f => sparkSession.sessionState.conf.resolver(f._1, attr.name))
+        if(UpdateValueOption.isEmpty) attr else UpdateValueOption.get._2
+      })
       .filter { // filter the meta columns
         case attr: AttributeReference =>
           !HoodieRecord.HOODIE_META_COLUMNS.asScala.toSet.contains(attr.name)

hudi-spark-datasource/hudi-spark/src/test/scala/org/apache/spark/sql/hudi/TestUpdateTable.scala

@@ -27,16 +27,16 @@ class TestUpdateTable extends TestHoodieSqlBase {
         spark.sql(
           s"""
              |create table $tableName (
-             |  id int,
+             |  ID int,
-             |  name string,
+             |  NAME string,
-             |  price double,
+             |  PRICE double,
-             |  ts long
+             |  TS long
              |) using hudi
              | location '${tmp.getCanonicalPath}/$tableName'
-             | tblproperties (
+             | options (
              |  type = '$tableType',
-             |  primaryKey = 'id',
+             |  primaryKey = 'ID',
-             |  preCombineField = 'ts'
+             |  preCombineField = 'TS'
              | )
        """.stripMargin)
         // insert data to table
@@ -59,4 +59,45 @@ class TestUpdateTable extends TestHoodieSqlBase {
       }
     }
   }
+
+  test("Test ignoring case for Update Table") {
+    withTempDir { tmp =>
+      Seq("cow", "mor").foreach {tableType =>
+        val tableName = generateTableName
+        // create table
+        spark.sql(
+          s"""
+             |create table $tableName (
+             |  id int,
+             |  name string,
+             |  price double,
+             |  ts long
+             |) using hudi
+             | location '${tmp.getCanonicalPath}/$tableName'
+             | tblproperties (
+             |  type = '$tableType',
+             |  primaryKey = 'id',
+             |  preCombineField = 'ts'
+             | )
+       """.stripMargin)
+        // insert data to table
+        spark.sql(s"insert into $tableName select 1, 'a1', 10, 1000")
+        checkAnswer(s"select id, name, price, ts from $tableName")(
+          Seq(1, "a1", 10.0, 1000)
+        )
+
+        // update data
+        spark.sql(s"update $tableName set PRICE = 20 where ID = 1")
+        checkAnswer(s"select id, name, price, ts from $tableName")(
+          Seq(1, "a1", 20.0, 1000)
+        )
+
+        // update data
+        spark.sql(s"update $tableName set PRICE = PRICE * 2 where ID = 1")
+        checkAnswer(s"select id, name, price, ts from $tableName")(
+          Seq(1, "a1", 40.0, 1000)
+        )
+      }
+    }
+  }
 }