Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Query / PlanCompiler / CodeGen.cs / 1305376 / CodeGen.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; //using System.Diagnostics; // Please use PlanCompiler.Assert instead of Debug.Assert in this class... using System.Globalization; using md = System.Data.Metadata.Edm; using System.Data.Common.CommandTrees; using System.Data.Query.InternalTrees; using System.Data.Query.PlanCompiler; // // The CodeGen module is responsible for translating the ITree finally into a query // We assume that various tree transformations have taken place, and the tree // is finally ready to be executed. The CodeGen module // * converts the Itree into one or more CTrees (in S space) // * produces a ColumnMap to facilitate result assembly // * and wraps up everything in a plan object // // namespace System.Data.Query.PlanCompiler { internal class CodeGen { #region public methods ////// This involves /// * Converting the ITree into a set of ProviderCommandInfo objects /// * Creating a column map to enable result assembly /// Currently, we only produce a single ITree, and correspondingly, the /// following steps are trivial /// /// current compiler state /// CQTs for each store command /// column map to help in result assembly internal static void Process(PlanCompiler compilerState, out ListchildCommands, out ColumnMap resultColumnMap, out int columnCount) { CodeGen codeGen = new CodeGen(compilerState); codeGen.Process(out childCommands, out resultColumnMap, out columnCount); } #endregion #region constructors private CodeGen(PlanCompiler compilerState) { m_compilerState = compilerState; } #endregion #region private methods /// /// The real driver. This routine walks the tree, converts each subcommand /// into a CTree, and converts the columnmap into a real column map. /// Finally, it produces a "real" plan that can be used by the bridge execution, and /// returns this plan /// /// The root of the tree must be a PhysicalProjectOp. Each child of this Op /// represents a command to be executed, and the ColumnMap of this Op represents /// the eventual columnMap to be used for result assembly /// /// CQTs for store commands /// column map for result assembly private void Process(out ListchildCommands, out ColumnMap resultColumnMap, out int columnCount) { PhysicalProjectOp projectOp = (PhysicalProjectOp)this.Command.Root.Op; this.m_subCommands = new List (new Node[] { this.Command.Root }); childCommands = new List (new ProviderCommandInfo[] { ProviderCommandInfoUtils.Create( this.Command, this.Command.Root // input node )}); // Build the final column map, and count the columns we expect for it. resultColumnMap = BuildResultColumnMap(projectOp); columnCount = projectOp.Outputs.Count; } private ColumnMap BuildResultColumnMap(PhysicalProjectOp projectOp) { // convert the column map into a real column map // build up a dictionary mapping Vars to their real positions in the commands Dictionary> varMap = BuildVarMap(); ColumnMap realColumnMap = ColumnMapTranslator.Translate(projectOp.ColumnMap, varMap); return realColumnMap; } /// /// For each subcommand, build up a "location-map" for each top-level var that /// is projected out. This location map will ultimately be used to convert VarRefColumnMap /// into SimpleColumnMap /// private Dictionary> BuildVarMap() { Dictionary> varMap = new Dictionary>(); int commandId = 0; foreach (Node subCommand in m_subCommands) { PhysicalProjectOp projectOp = (PhysicalProjectOp)subCommand.Op; int columnPos = 0; foreach (Var v in projectOp.Outputs) { KeyValuePairvarLocation = new KeyValuePair (commandId, columnPos); varMap[v] = varLocation; columnPos++; } commandId++; } return varMap; } #endregion #region private state private PlanCompiler m_compilerState; private Command Command { get { return m_compilerState.Command; } } private List m_subCommands; #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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