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From arina-ielchiieva <...@git.apache.org>
Subject [GitHub] drill pull request #666: DRILL-4956: Temporary tables support
Date Tue, 17 Jan 2017 15:30:41 GMT
Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/666#discussion_r95813048
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/rpc/user/UserSession.java
---
    @@ -207,18 +245,85 @@ public SchemaPlus getDefaultSchema(SchemaPlus rootSchema) {
           return null;
         }
     
    -    final SchemaPlus defaultSchema = SchemaUtilites.findSchema(rootSchema, defaultSchemaPath);
    +    return SchemaUtilites.findSchema(rootSchema, defaultSchemaPath);
    +  }
     
    -    if (defaultSchema == null) {
    -      // If the current schema resolves to null, return root schema as the current default
schema.
    -      return defaultSchema;
    +  public boolean setSessionOption(String name, String value) {
    +    return true;
    +  }
    +
    +  /**
    +   * @return unique session identifier
    +   */
    +  public String getSessionId() { return sessionId; }
    +
    +  /**
    +   * Creates and adds session temporary location if absent using schema configuration.
    +   * Generates temporary table name and stores it's original name as key
    +   * and generated name as value in  session temporary tables cache.
    +   * If original table name already exists, new name is not regenerated and is reused.
    +   * This can happen if default temporary workspace was changed (file system or location)
or
    +   * orphan temporary table name has remained (name was registered but table creation
did not succeed).
    +   *
    +   * @param schema table schema
    +   * @param tableName original table name
    +   * @return generated temporary table name
    +   * @throws IOException if error during session temporary location creation
    +   */
    +  public String registerTemporaryTable(AbstractSchema schema, String tableName) throws
IOException {
    +    if (schema instanceof WorkspaceSchemaFactory.WorkspaceSchema) {
    +      addTemporaryLocation((WorkspaceSchemaFactory.WorkspaceSchema) schema);
    +      String temporaryTableName = Paths.get(sessionId, UUID.randomUUID().toString()).toString();
    +      String oldTemporaryTableName = temporaryTables.putIfAbsent(tableName, temporaryTableName);
    +      return oldTemporaryTableName == null ? temporaryTableName : oldTemporaryTableName;
    +    } else {
    +      throw new DrillRuntimeException("Temporary workspace must be instance of WorkspaceSchemaFactory.WorkspaceSchema");
         }
    +  }
     
    -    return defaultSchema;
    +  /**
    +   * Returns generated temporary table name from the list of session temporary tables,
null otherwise.
    +   *
    +   * @param tableName original table name
    +   * @return generated temporary table name
    +   */
    +  public String findTemporaryTable(String tableName) {
    +    return temporaryTables.get(tableName);
       }
     
    -  public boolean setSessionOption(String name, String value) {
    -    return true;
    +  /**
    +   * Removes temporary table name from the list of session temporary tables.
    +   *
    +   * @param tableName original table name
    +   */
    +  public void removeTemporaryTable(String tableName) {
    --- End diff --
    
    Agree. Done.


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