Expressions initial checkin

docs/QueryDSL.org

+#+TITLE:     Query DSL
+#+AUTHOR:    Harish Butani
+#+EMAIL:     hbutani@apache.org
+#+LANGUAGE:  en
+#+INFOJS_OPT: view:showall toc:t ltoc:t mouse:underline path:http://orgmode.org/org-info.js
+#+LINK_HOME: http://home.fnal.gov/~neilsen
+#+LINK_UP: http://home.fnal.gov/~neilsen/notebook
+#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="http://orgmode.org/org-manual.css" />
+#+LaTeX_CLASS: smarticle
+#+LaTeX_HEADER: \pdfmapfile{/home/neilsen/texmf/fonts/map/dvips/libertine/libertine.map}
+#+LaTeX_HEADER: \usepackage[ttscale=.875]{libertine}
+#+LaTeX_HEADER: \usepackage{sectsty}
+#+LaTeX_HEADER: \sectionfont{\normalfont\scshape}
+#+LaTeX_HEADER: \subsectionfont{\normalfont\itshape}
+#+EXPORT_SELECT_TAGS: export
+#+EXPORT_EXCLUDE_TAGS: noexport
+#+OPTIONS: H:2 num:nil toc:nil \n:nil @:t ::t |:t ^:{} _:{} *:t TeX:t LaTeX:t
+#+STARTUP: showall
+#+OPTIONS: html-postamble:nil
+
+** Example Type Definitions
+#+begin_src plantuml :file class_diagram.png
+scale 1300 width
+
+note left of Trait : traits are classifications/tags attached to Instances
+class Trait
+Trait <|-- JDbcAccess 
+Trait <|-- PII
+Trait <|-- Dimension
+Trait <|-- Metric
+Trait <|-- ETL
+
+class Object
+
+Object --* Trait : traits >
+
+Object <|-- DB
+Object <|-- Table
+Object <|-- Column
+
+class DB {
+ name : String
+ owner : String
+}
+
+class StorageDescriptor {
+  inputFormat : String
+  outputFormat : String
+}
+
+class Column {
+  name : String
+  dataType : String
+}
+
+class Table {
+ name: String
+ db: DB
+}
+Table -> StorageDescriptor : storageDesc >
+Table -> DB : db >
+
+Column *-> StorageDescriptor : storageDesc >
+
+class LoadProcess {
+ name String
+}
+LoadProcess -* Table : inputTables >
+LoadProcess -> Table : outputTable >
+
+class View {
+ name String
+}
+View -* Table : inputTables >
+
+#+end_src
+
+#+CAPTION: ETL and Reporting Scenario Types
+#+LABEL: fig:sampleTypeDefs
+#+results:
+[[file:class_diagram.png]]
+
+** Example Instance Graph
+#+begin_src dot :file instanceGraph.png :cmdline -Kdot -Tpng
+digraph G {
+  //size ="6 6";
+  nodesep=.2;
+  //rankdir=LR;
+  ranksep=.25;
+  node [shape=record fontsize=9];
+  compound=true;
+
+subgraph cluster0 {
+  style=bold;
+  label = "Sales Database"; fontsize=18;
+  salesDB[label="DB(sales)"]
+  
+  salesFact[label="Table(sales_fact)" style=filled; color="khaki"]
+  salesStorage[label="Storage(text,text)"]
+  sales_time_id[label="time_id" shape="circle" style=filled color="peachpuff"]
+  sales_product_id[label="product_id" shape="circle" style=filled color="peachpuff"]
+  sales_customer_id[label="customer_id" shape="circle" style=filled color="peachpuff"]
+  sales_sales[label="sales" shape="circle" style=filled color="peachpuff"]
+  sales_sales_metric[label="Metric" style=filled; shape="ellipse" color="turquoise"]
+  
+  salesFact -> salesDB;
+  salesFact -> salesStorage;
+  sales_time_id -> salesStorage;
+  sales_product_id -> salesStorage;
+  sales_customer_id -> salesStorage;
+  sales_sales -> salesStorage;
+  sales_sales -> sales_sales_metric;
+  
+  productDim[label="Table(product_dim)" style=filled; color="khaki"]
+  productStorage[label="Storage(text,text)"]
+  product_product_id[label="product_id" shape="circle" style=filled color="peachpuff"]
+  product_product_name[label="product_name" shape="circle" style=filled color="peachpuff"]
+  product_brand_name[label="brand_name" shape="circle" style=filled color="peachpuff"]
+  product_dimension[label="Dimension" style=filled; shape="ellipse" color="turquoise"]
+  
+  productDim -> salesDB;
+  productDim  -> productStorage;
+  product_product_id -> productStorage;
+  product_product_name -> productStorage;
+  product_brand_name -> productStorage;
+  productDim -> product_dimension;
+
+  productDim -> salesFact [style=invis];
+  
+  timeDim[label="Table(time_dim)" style=filled; color="khaki"]
+  timeStorage[label="Storage(text,text)"]
+  time_time_id[label="time_id" shape="circle" style=filled color="peachpuff"]
+  time_dayOfYear[label="day_of_year" shape="circle" style=filled color="peachpuff"]
+  time_weekDay[label="week_day" shape="circle" style=filled color="peachpuff"]
+  time_dimension[label="Dimension" style=filled; shape="ellipse" color="turquoise"]
+  
+  timeDim -> salesDB;
+  timeDim  -> timeStorage;
+  time_time_id -> timeStorage;
+  time_dayOfYear -> timeStorage;
+  time_weekDay -> timeStorage;
+  timeDim -> time_dimension;
+
+  timeDim -> productDim [style=invis];
+  
+  customerDim[label="Table(customer_dim)" style=filled; color="khaki"]
+  customerStorage[label="Storage(text,text)"]
+  customer_customer_id[label="customer_id" shape="circle" style=filled color="peachpuff"]
+  customer_name[label="name" shape="circle" style=filled color="peachpuff"]
+  customer_address[label="address" shape="circle" style=filled color="peachpuff"]
+  customer_dimension[label="Dimension" style=filled; shape="ellipse" color="turquoise"]
+  address_pii[label="PII" style=filled; shape="ellipse" color="turquoise"]
+  
+  customerDim -> salesDB;
+  customerDim  -> customerStorage;
+  customer_customer_id -> customerStorage;
+  customer_name -> customerStorage;
+  customer_address -> customerStorage;
+  customerDim -> customer_dimension;
+  customer_address -> address_pii;
+
+  customerDim -> timeDim [style=invis];
+
+ //{rank=min; salesDB};
+ {rank=min; salesDB};
+};
+
+subgraph cluster1 {
+  style=bold;
+  label = "Reporting Database"; fontsize=18;
+
+  reportingDB[label="DB(reporting)"]
+  salesFactDaily[label="Table(sales_daily_mv)" style=filled; color="khaki"]
+  salesDailyStorage[label="Storage(orc,orc)"]
+  salesD_time_id[label="time_id" shape="circle" style=filled color="peachpuff"]
+  salesD_product_id[label="product_id" shape="circle" style=filled color="peachpuff"]
+  salesD_customer_id[label="customer_id" shape="circle" style=filled color="peachpuff"]
+  salesD_sales[label="sales" shape="circle" style=filled color="peachpuff"]
+  salesD_sales_metric[label="Metric" style=filled; shape="ellipse" color="turquoise"]
+  
+  salesFactDaily -> reportingDB;
+  salesFactDaily -> salesDailyStorage;
+  salesD_time_id -> salesDailyStorage;
+  salesD_product_id -> salesDailyStorage;
+  salesD_customer_id -> salesDailyStorage;
+  salesD_sales -> salesDailyStorage;
+  salesD_sales -> salesD_sales_metric;
+
+   salesFactDaily -> reportingDB [style=invis];
+
+   productDimView[label="View(product_dim_v)"  style=filled; color="khaki"]
+   productDim -> productDimView [style=dotted];
+   productDimView_dim[label="Dimension" style=filled; shape="ellipse" color="turquoise"]
+   productDimView_jdbc[label="JdbcAccess" style=filled; shape="ellipse" color="turquoise"]
+   productDimView -> productDimView_dim;
+   productDimView -> productDimView_jdbc;
+   productDimView -> salesFactDaily [style=invis];
+
+   customerDimView[label="View(customer_dim_v)"  style=filled; color="khaki"]
+   customerDim -> customerDimView [style=dotted];
+   customerDimView_dim[label="Dimension" style=filled; shape="ellipse" color="turquoise"]
+   customerDimView_jdbc[label="JdbcAccess" style=filled; shape="ellipse" color="turquoise"]
+   customerDimView -> customerDimView_dim;
+   customerDimView -> customerDimView_jdbc;
+   customerDimView -> salesFactDaily [style=invis];
+
+  salesMonthly[label="Table(sales_monthly_mv)"  style=filled; color="khaki"]
+  salesMonthlyStorage[label="Storage(orc,orc)"]
+  salesM_time_id[label="time_id" shape="circle" style=filled color="peachpuff"]
+  salesM_product_id[label="product_id" shape="circle" style=filled color="peachpuff"]
+  salesM_customer_id[label="customer_id" shape="circle" style=filled color="peachpuff"]
+  salesM_sales[label="sales" shape="circle" style=filled color="peachpuff"]
+  salesM_sales_metric[label="Metric" style=filled; shape="ellipse" color="turquoise"]
+  
+  salesMonthly -> reportingDB;
+  salesMonthly -> salesMonthlyStorage;
+  salesM_time_id -> salesMonthlyStorage;
+  salesM_product_id -> salesMonthlyStorage;
+  salesM_customer_id -> salesMonthlyStorage;
+  salesM_sales -> salesMonthlyStorage;
+  salesM_sales -> salesM_sales_metric;
+
+  salesMonthly -> customerDimView [style=invis];
+
+  {rank=min; reportingDB};
+
+};
+
+  loadSalesDaily[label="LoadProcess(loadSalesDaily)" style=filled; color="seagreen"; shape="octagon"]
+  loadSalesDaily_etl[label="ETL" style=filled; shape="ellipse" color="turquoise"]
+  salesFact -> loadSalesDaily [style=dotted];
+  timeDim -> loadSalesDaily [style=dotted];
+  loadSalesDaily -> salesFactDaily  [style=dotted];
+  loadSalesDaily -> loadSalesDaily_etl;
+
+  loadSalesMonthly[label="LoadProcess(loadSalesMonthly)" style=filled; color="seagreen"; shape="octagon"]
+  loadSalesMonthly_etl[label="ETL" style=filled; shape="ellipse" color="turquoise"]
+  salesFactDaily -> loadSalesMonthly [style=dotted];
+  timeDim -> loadSalesMonthly [style=dotted];
+  loadSalesMonthly -> salesMonthly  [style=dotted];
+  loadSalesMonthly -> loadSalesMonthly_etl;
+
+}
+#+end_src
+
+#+CAPTION: ETL and Reporting Scenario
+#+LABEL: fig:sampleInstanceGraph
+#+results:
+[[file:instanceGraph.png]]
+

typesystem/src/main/scala/org/apache/hadoop/metadata/query/QueryProcessor.scala

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.metadata.query
+
+import Expressions._
+
+object QueryProcessor {
+
+  def validate(e : Expression) : Expression = {
+    val e1 = e.transformUp(new Resolver())
+
+    e1.traverseUp {
+      case x : Expression if !x.resolved =>
+        throw new ExpressionException(x, s"Failed to resolved expression $x")
+    }
+
+    /*
+     * trigger computation of dataType of expression tree
+     */
+    e1.dataType
+
+    e1
+  }
+
+}

typesystem/src/main/scala/org/apache/hadoop/metadata/query/Resolver.scala

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.metadata.query
+
+import Expressions._
+
+class Resolver(srcExpr : Option[Expression] = None, aliases : Map[String, Expression] = Map())
+extends PartialFunction[Expression, Expression] {
+
+  import TypeUtils._
+
+  def isDefinedAt(x: Expression) = true
+
+  def apply(e : Expression) : Expression = e match {
+    case idE@IdExpression(name) => {
+      val cType = resolveAsClassType(name)
+      if (cType.isDefined) {
+        return new ClassExpression(name)
+      }
+      val tType = resolveAsTraitType(name)
+      if (tType.isDefined) {
+        return new TraitExpression(name)
+      }
+      if (srcExpr.isDefined ) {
+        val fInfo = resolveReference(srcExpr.get.dataType, name)
+        if ( fInfo.isDefined) {
+          return new FieldExpression(name, fInfo.get, None)
+        }
+      }
+      val backExpr = aliases.get(name)
+      if ( backExpr.isDefined) {
+        return new BackReference(name, backExpr.get, None)
+      }
+      idE
+    }
+    case f@UnresolvedFieldExpression(child, fieldName) if child.resolved => {
+      var fInfo : Option[FieldInfo] = None
+
+      fInfo = resolveReference(child.dataType, fieldName)
+      if ( fInfo.isDefined) {
+        return new FieldExpression(fieldName, fInfo.get, Some(child))
+      }
+      f
+    }
+    case isTraitLeafExpression(traitName, classExpression)
+      if srcExpr.isDefined  && !classExpression.isDefined =>
+      isTraitLeafExpression(traitName, srcExpr)
+    case hasFieldLeafExpression(traitName, classExpression)
+      if srcExpr.isDefined  && !classExpression.isDefined =>
+      hasFieldLeafExpression(traitName, srcExpr)
+    case f@FilterExpression(inputExpr, condExpr) if inputExpr.resolved => {
+      val r = new Resolver(Some(inputExpr), inputExpr.namedExpressions)
+      return new FilterExpression(inputExpr, condExpr.transformUp(r))
+    }
+    case SelectExpression(child, selectList) if child.resolved => {
+      val r = new Resolver(Some(child), child.namedExpressions)
+      return new SelectExpression(child, selectList.map{_.transformUp(r)})
+    }
+    case x => x
+  }
+}

typesystem/src/main/scala/org/apache/hadoop/metadata/query/TypeUtils.scala

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.metadata.query
+
+import java.util.concurrent.atomic.AtomicInteger
+
+import org.apache.hadoop.metadata.MetadataException
+import org.apache.hadoop.metadata.types.DataTypes.PrimitiveType
+import org.apache.hadoop.metadata.types._
+
+object TypeUtils {
+  val typSystem = TypeSystem.getInstance()
+
+  def numericTypes : Seq[PrimitiveType[_]] = Seq(DataTypes.BYTE_TYPE,
+    DataTypes.SHORT_TYPE,
+    DataTypes.INT_TYPE,
+    DataTypes.FLOAT_TYPE,
+    DataTypes.LONG_TYPE,
+    DataTypes.DOUBLE_TYPE,
+    DataTypes.BIGINTEGER_TYPE,
+    DataTypes.BIGDECIMAL_TYPE)
+
+  def combinedType(typ1 : IDataType[_], typ2 : IDataType[_]) : PrimitiveType[_] = {
+    val typ1Idx =  if (numericTypes.contains(typ1))  Some(numericTypes.indexOf(typ1)) else None
+    val typ2Idx =  if (numericTypes.contains(typ2))  Some(numericTypes.indexOf(typ2)) else None
+
+    if ( typ1Idx.isDefined && typ2Idx.isDefined ) {
+      val rIdx = math.max(typ1Idx.get, typ2Idx.get)
+
+      if ( (typ1 == DataTypes.FLOAT_TYPE && typ2 == DataTypes.LONG_TYPE) ||
+        (typ1 == DataTypes.LONG_TYPE && typ2 == DataTypes.FLOAT_TYPE) ) {
+        return DataTypes.DOUBLE_TYPE
+      }
+      return numericTypes(rIdx)
+    }
+
+    throw new MetadataException(s"Cannot combine types: ${typ1.getName} and ${typ2.getName}")
+  }
+
+  var tempStructCounter : AtomicInteger = new AtomicInteger(0)
+  val TEMP_STRUCT_NAME_PREFIX = "__tempQueryResultStruct"
+  def createStructType(selectExprs : List[Expressions.AliasExpression]) : StructType = {
+    val aDefs = new Array[AttributeDefinition](selectExprs.size)
+    selectExprs.zipWithIndex.foreach { t =>
+      val (e,i) = t
+      aDefs(i) = new AttributeDefinition(e.alias,e.dataType.getName, Multiplicity.OPTIONAL, false, null)
+    }
+    return typSystem.defineQueryResultType(s"${TEMP_STRUCT_NAME_PREFIX}${tempStructCounter.getAndIncrement}",
+      aDefs:_*);
+  }
+
+  def fieldMapping(iDataType: IDataType[_]) : Option[FieldMapping] = iDataType match {
+    case c : ClassType => Some(c.fieldMapping())
+    case t : TraitType => Some(t.fieldMapping())
+    case s : StructType => Some(s.fieldMapping())
+    case _ => None
+  }
+
+  import scala.language.existentials
+  case class FieldInfo(dataType : IDataType[_], attrInfo : AttributeInfo, reverseDataType : IDataType[_] = null) {
+    def isReverse = reverseDataType != null
+  }
+
+  /**
+   * Given a ComposedType `t` and a name resolve using the following rules:
+   * - if `id` is a field in `t` resolve to the field
+   * - if `id` is the name of a  Struct|Class|Trait Type and it has a field that is of type `t` then return that type
+   *
+   * For e.g.
+   * 1. if we have types Table(name : String, cols : List[Column]), Column(name : String) then
+   * `resolveReference(Table, "cols")` resolves to type Column. So a query can be "Table.cols"
+   * 2. But if we have Table(name : String), Column(name : String, tbl : Table) then "Table.Column" will resolve
+   * to type Column
+   *
+   * This way the language will support navigation even if the relationship is one-sided.
+   *
+   * @param typ
+   * @param id
+   * @return
+   */
+  def resolveReference(typ : IDataType[_], id : String) : Option[FieldInfo] = {
+
+    val fMap = fieldMapping(typ)
+    if ( fMap.isDefined) {
+
+      if (fMap.get.fields.containsKey(id)) {
+        return Some(FieldInfo(typ,fMap.get.fields.get(id)))
+      }
+
+      try {
+        val idTyp = typSystem.getDataType(classOf[IDataType[_]], id)
+        val idTypFMap = fieldMapping(idTyp)
+        if (idTypFMap.isDefined) {
+          import scala.collection.JavaConversions._
+          val fields: Seq[AttributeInfo] = idTypFMap.get.fields.values().filter { aInfo =>
+            aInfo.dataType() == typ
+          }.toSeq
+          if (fields.size == 1) {
+            return Some(FieldInfo(typ, fields(0), idTyp))
+          }
+        }
+      } catch {
+        case _ : MetadataException => None
+      }
+    }
+    None
+  }
+
+  def resolveAsClassType(id : String) : Option[ClassType] = {
+    try {
+      Some(typSystem.getDataType(classOf[ClassType], id))
+    } catch {
+      case _ : MetadataException => None
+    }
+  }
+
+  def resolveAsTraitType(id : String) : Option[TraitType] = {
+    try {
+      Some(typSystem.getDataType(classOf[TraitType], id))
+    } catch {
+      case _ : MetadataException => None
+    }
+  }
+
+}

typesystem/src/test/scala/org/apache/hadoop/metadata/query/ExpressionTest.scala

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.metadata.query
+
+import com.google.common.collect.ImmutableList
+import org.apache.hadoop.metadata.BaseTest
+import org.apache.hadoop.metadata.types._
+import org.junit.{Before, Test}
+import Expressions._
+
+class ExpressionTest extends BaseTest {
+
+  @Before
+  override def setup {
+    super.setup
+
+    def attrDef(name : String, dT : IDataType[_],
+                m : Multiplicity = Multiplicity.OPTIONAL,
+                isComposite: Boolean = false,
+                reverseAttributeName: String = null) = {
+      require(name != null)
+      require(dT != null)
+      new AttributeDefinition(name, dT.getName, m, isComposite, reverseAttributeName)
+    }
+
+    def dbClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "DB", null,
+      Array(
+        attrDef("name", DataTypes.STRING_TYPE),
+        attrDef("owner", DataTypes.STRING_TYPE)
+      ))
+
+    def storageDescClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "StorageDesc", null,
+      Array(
+        attrDef("inputFormat", DataTypes.STRING_TYPE),
+        attrDef("outputFormat", DataTypes.STRING_TYPE)
+      ))
+
+    def columnClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "Column", null,
+      Array(
+        attrDef("name", DataTypes.STRING_TYPE),
+        attrDef("dataType", DataTypes.STRING_TYPE),
+        new AttributeDefinition("sd", "StorageDesc", Multiplicity.REQUIRED, false, null)
+      ))
+
+    def tblClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "Table", null,
+      Array(
+        attrDef("name", DataTypes.STRING_TYPE),
+        new AttributeDefinition("db", "DB", Multiplicity.REQUIRED, false, null),
+        new AttributeDefinition("sd", "StorageDesc", Multiplicity.REQUIRED, false, null)
+      ))
+
+    def loadProcessClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "LoadProcess", null,
+      Array(
+        attrDef("name", DataTypes.STRING_TYPE),
+        new AttributeDefinition("inputTables", "Table", Multiplicity.COLLECTION, false, null),
+        new AttributeDefinition("outputTable", "Table", Multiplicity.REQUIRED, false, null)
+      ))
+
+    def viewClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "View", null,
+      Array(
+        attrDef("name", DataTypes.STRING_TYPE),
+        new AttributeDefinition("inputTables", "Table", Multiplicity.COLLECTION, false, null)
+      ))
+
+    def dimTraitDef = new HierarchicalTypeDefinition[TraitType](classOf[TraitType], "Dimension", null,
+      Array[AttributeDefinition]())
+    def piiTraitDef = new HierarchicalTypeDefinition[TraitType](classOf[TraitType], "PII", null,
+      Array[AttributeDefinition]())
+    def metricTraitDef = new HierarchicalTypeDefinition[TraitType](classOf[TraitType], "Metric", null,
+      Array[AttributeDefinition]())
+    def etlTraitDef = new HierarchicalTypeDefinition[TraitType](classOf[TraitType], "ETL", null,
+      Array[AttributeDefinition]())
+    def jdbcTraitDef = new HierarchicalTypeDefinition[TraitType](classOf[TraitType], "Jdbc", null,
+      Array[AttributeDefinition]())
+
+    getTypeSystem.defineTypes(ImmutableList.of[StructTypeDefinition],
+      ImmutableList.of[HierarchicalTypeDefinition[TraitType]](dimTraitDef, piiTraitDef,
+        metricTraitDef, etlTraitDef, jdbcTraitDef),
+      ImmutableList.of[HierarchicalTypeDefinition[ClassType]](dbClsDef, storageDescClsDef, columnClsDef, tblClsDef,
+        loadProcessClsDef, viewClsDef))
+
+  }
+
+  @Test def testClass: Unit = {
+    val e = QueryProcessor.validate(_class("DB"))
+    println(e)
+  }
+
+  @Test def testFilter: Unit = {
+    val e = QueryProcessor.validate(_class("DB").where(id("name").`=`(string("Reporting"))))
+    println(e)
+  }
+
+  @Test def testSelect: Unit = {
+    val e = QueryProcessor.validate(_class("DB").where(id("name").`=`(string("Reporting"))).
+    select(id("name"), id("owner")))
+    println(e)
+  }
+
+  @Test def testNegTypeTest: Unit = {
+    try {
+      val e = QueryProcessor.validate(_class("DB").where(id("name")))
+      println(e)
+    } catch {
+      case e : ExpressionException if e.getMessage.endsWith("expression: DB where name") => ()
+    }
+  }
+
+  @Test def testIsTrait: Unit = {
+    val e = QueryProcessor.validate(_class("DB").where(isTrait("Jdbc")))
+    println(e)
+  }
+
+  @Test def testIsTraitNegative: Unit = {
+    try {
+    val e = QueryProcessor.validate(_class("DB").where(isTrait("Jdb")))
+    println(e)
+    } catch {
+      case e : ExpressionException if e.getMessage.endsWith("not a TraitType, expression:  is Jdb") => ()
+    }
+  }
+
+  @Test def testhasField: Unit = {
+    val e = QueryProcessor.validate(_class("DB").where(hasField("name")))
+    println(e)
+  }
+
+  @Test def testHasFieldNegative: Unit = {
+    try {
+      val e = QueryProcessor.validate(_class("DB").where(hasField("nam")))
+      println(e)
+    } catch {
+      case e : ExpressionException if e.getMessage.endsWith("not a TraitType, expression:  is Jdb") => ()
+    }
+  }
+
+  @Test def testFieldReference: Unit = {
+    val e = QueryProcessor.validate(_class("DB").field("Table"))
+    println(e)
+  }
+
+  @Test def testBackReference: Unit = {
+    val e = QueryProcessor.validate(
+      _class("DB").as("db").field("Table")).where(id("db").field("name").`=`(string("Reporting")))
+    println(e)
+  }
+}