BUG-32980 add is operator in Query DSL

repository/src/main/scala/org/apache/hadoop/metadata/query/Expressions.scala

@@ -523,7 +523,7 @@ object Expressions {
     case class isTraitUnaryExpression(traitName: String, child: Expression)
         extends Expression with UnaryNode {
         // validate TraitName
-        typSystem.getDataType(classOf[ClassType], traitName)
+        typSystem.getDataType(classOf[TraitType], traitName)
         lazy val dataType = {
             if (!resolved) {
                 throw new UnresolvedException(this,

repository/src/main/scala/org/apache/hadoop/metadata/query/QueryParser.scala

@@ -57,6 +57,7 @@ trait QueryKeywords {
     protected val GROUPBY = Keyword("groupby")
     protected val LOOP = Keyword("loop")
     protected val ISA = Keyword("isa")
+    protected val IS = Keyword("is")
     protected val HAS = Keyword("has")
     protected val AS = Keyword("as")
     protected val TIMES = Keyword("times")
@@ -195,7 +196,7 @@ class QueryParser extends StandardTokenParsers with QueryKeywords with Expressio
 
     def compE =
         arithE ~ (LT | LTE | EQ | NEQ | GT | GTE) ~ arithE ^^ { case l ~ op ~ r => l.compareOp(op)(r)} |
-            arithE ~ ISA ~ ident ^^ { case l ~ i ~ t => l.isTrait(t)} |
+            arithE ~ (ISA | IS) ~ ident ^^ { case l ~ i ~ t => l.isTrait(t)} |
             arithE ~ HAS ~ ident ^^ { case l ~ i ~ f => l.hasField(f)} |
             arithE
 

repository/src/test/scala/org/apache/hadoop/metadata/query/ParserTest.scala

@@ -57,6 +57,12 @@ class ParserTest extends BaseTest {
         println(p("DB name = \"Reporting\"").right.get.toString)
     }
 
+  @Test def testIsTrait: Unit = {
+    val p = new QueryParser
+    println(p("Table isa Dimension").right.get.toString)
+    println(p("Table is Dimension").right.get.toString)
+  }
+
     @Test def test4: Unit = {
         val p = new QueryParser
         println(p("DB where (name = \"Reporting\") select name as _col_0, (createTime + 1) as _col_1").right.get.toString)