cmu-db / peloton / 5743

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Schema - Layout decoupling  (#1327)

* Added layout.h. Modified Runtime functions to handle row stores.

* Modify TileGroup api

* Changed Updater & Inserter to use Layout object

* Remove calls from optimizer and executor

* Removed all calls to schemas vector from TileGroup

* Removed Calls to LocateTileAndColumn for TileGroup

* Moved definition of column_map_type. Removed column_map from tile_group

* Added GetInfo function

* make check pases. Need to change a few more function calls

* Convert PL_ASSERT -> PELOTON_ASSERT

* Modified DataTable and LayoutTunerTest

* Added Layout Test for codegen

* Get the tests to actually use different layouts

* Modified storage layer, builds successfully. Need to fix tests

* Moved GetColumnMapStats -> GetColumnLayoutStats

* Minor change in TableScanTranslator

* Modify TransformTileGroup

* Change layout.cpp to better handle HYBRID layouts

* use std::make_shared

* Modified tests to change calls to GetTileGroup()

* make check passes. Need to add test with hybrid layout.

* Modify print functions

* Add TODOs for catalog

* Added LayoutCatalog. Yet to modify TableCatalog

* Added catalog functions

* Added DeleteLayouts to delete all layouts of a table_oid

* LayoutTunerTest fixed

* Fix build failures

* Access LayoutCatalog via the global Catalog object

* Added Multi layout scan test

* Fixed tests after catalog refactor

* Failing LayoutCatalog test because of deserialization

* Fix all tests

* Added documentation

* Style Fix

* Address review comments + minor clean-up in the layout.h API

* Change valid_layout_objects_

* Revert unused changes

* Addressed Prashanth's initial comments

* Modify CreateTable for tests + modify LayoutTuner

* Address Pervaze's review comments.

* Changed after Prashanth's review

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