Refactor compression file organization

Move compression dml code into separate file, moves code dealing
with ScanKey into separate file and move compression algorithms code
into dedicated subdirectory.

tsl/src/compression/CMakeLists.txt

@@ -1,12 +1,11 @@
 set(SOURCES
     ${CMAKE_CURRENT_SOURCE_DIR}/api.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/array.c
     ${CMAKE_CURRENT_SOURCE_DIR}/compression.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/compression_dml.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/compression_scankey.c
     ${CMAKE_CURRENT_SOURCE_DIR}/compression_storage.c
     ${CMAKE_CURRENT_SOURCE_DIR}/create.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/datum_serialize.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/deltadelta.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/dictionary.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/gorilla.c
     ${CMAKE_CURRENT_SOURCE_DIR}/segment_meta.c)
 target_sources(${TSL_LIBRARY_NAME} PRIVATE ${SOURCES})
+
+add_subdirectory(algorithms)

tsl/src/compression/algorithms/CMakeLists.txt

@@ -0,0 +1,7 @@
+set(SOURCES
+    ${CMAKE_CURRENT_SOURCE_DIR}/array.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/datum_serialize.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/deltadelta.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/dictionary.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/gorilla.c)
+target_sources(${TSL_LIBRARY_NAME} PRIVATE ${SOURCES})

tsl/src/compression/array.c → tsl/src/compression/algorithms/array.c

@@ -14,11 +14,11 @@
 #include <utils/lsyscache.h>
 #include <utils/syscache.h>
 
-#include "compression/array.h"
+#include "array.h"
 #include "compression/compression.h"
-#include "compression/simple8b_rle.h"
-#include "compression/simple8b_rle_bitmap.h"
 #include "datum_serialize.h"
+#include "simple8b_rle.h"
+#include "simple8b_rle_bitmap.h"
 
 #include "compression/arrow_c_data_interface.h"
 

tsl/src/compression/datum_serialize.c → tsl/src/compression/algorithms/datum_serialize.c

@@ -17,10 +17,9 @@
 #include <utils/syscache.h>
 #include <utils/typcache.h>
 
-#include "compat/compat.h"
+#include <compat/compat.h>
 #include "datum_serialize.h"
-
-#include "compression.h"
+#include <compression/compression.h>
 
 typedef struct DatumSerializer
 {

tsl/src/compression/deltadelta.c → tsl/src/compression/algorithms/deltadelta.c

@@ -4,7 +4,7 @@
  * LICENSE-TIMESCALE for a copy of the license.
  */
 
-#include "compression/deltadelta.h"
+#include "deltadelta.h"
 
 #include <access/htup_details.h>
 #include <catalog/pg_aggregate.h>
@@ -22,8 +22,8 @@
 
 #include "compression/arrow_c_data_interface.h"
 #include "compression/compression.h"
-#include "compression/simple8b_rle.h"
-#include "compression/simple8b_rle_bitmap.h"
+#include "simple8b_rle.h"
+#include "simple8b_rle_bitmap.h"
 
 static uint64 zig_zag_encode(uint64 value);
 static uint64 zig_zag_decode(uint64 value);

tsl/src/compression/dictionary.c → tsl/src/compression/algorithms/dictionary.c

@@ -19,14 +19,14 @@
 #include <utils/syscache.h>
 #include <utils/typcache.h>
 
-#include "compression/array.h"
+#include "array.h"
 #include "compression/arrow_c_data_interface.h"
 #include "compression/compression.h"
-#include "compression/datum_serialize.h"
-#include "compression/dictionary.h"
-#include "compression/dictionary_hash.h"
-#include "compression/simple8b_rle.h"
-#include "compression/simple8b_rle_bitmap.h"
+#include "datum_serialize.h"
+#include "dictionary.h"
+#include "dictionary_hash.h"
+#include "simple8b_rle.h"
+#include "simple8b_rle_bitmap.h"
 
 /*
  * A compression bitmap is stored as

tsl/src/compression/gorilla.c → tsl/src/compression/algorithms/gorilla.c

@@ -14,14 +14,14 @@
 #include <utils/builtins.h>
 #include <utils/memutils.h>
 
-#include "compression/gorilla.h"
+#include "gorilla.h"
 
 #include "adts/bit_array.h"
 #include "compression/arrow_c_data_interface.h"
 #include "compression/compression.h"
-#include "compression/simple8b_rle.h"
-#include "compression/simple8b_rle_bitmap.h"
 #include "float_utils.h"
+#include "simple8b_rle.h"
+#include "simple8b_rle_bitmap.h"
 
 /*
  * Gorilla compressed data is stored as

tsl/src/compression/simple8b_rle_bitmap.h → tsl/src/compression/algorithms/simple8b_rle_bitmap.h

@@ -10,7 +10,7 @@
  * elements are only 0 and 1. It also counts the number of ones.
  */
 
-#include "compression/simple8b_rle.h"
+#include "simple8b_rle.h"
 
 typedef struct Simple8bRleBitmap
 {