diff --git a/internal/chstorage/_golden/col_attr_json.hex b/internal/chstorage/_golden/col_attr_json.hex
new file mode 100644
index 00000000..9d086a24
--- /dev/null
+++ b/internal/chstorage/_golden/col_attr_json.hex
@@ -0,0 +1,5 @@
+00000000  0b 7b 22 76 22 3a 22 66  6f 6f 22 7d 0b 7b 22 76  |.{"v":"foo"}.{"v|
+00000010  22 3a 22 66 6f 6f 22 7d  0b 7b 22 76 22 3a 22 62  |":"foo"}.{"v":"b|
+00000020  61 72 22 7d 0b 7b 22 76  22 3a 22 66 6f 6f 22 7d  |ar"}.{"v":"foo"}|
+00000030  0b 7b 22 76 22 3a 22 62  61 7a 22 7d 02 7b 7d 02  |.{"v":"baz"}.{}.|
+00000040  7b 7d 02 7b 7d                                    |{}.{}|
diff --git a/internal/chstorage/_golden/col_attr_json.raw b/internal/chstorage/_golden/col_attr_json.raw
new file mode 100644
index 00000000..6820823d
--- /dev/null
+++ b/internal/chstorage/_golden/col_attr_json.raw
@@ -0,0 +1 @@
+{"v":"foo"}{"v":"foo"}{"v":"bar"}{"v":"foo"}{"v":"baz"}{}{}{}
\ No newline at end of file
diff --git a/internal/chstorage/_golden/col_json_lc_attr.hex b/internal/chstorage/_golden/col_json_lc_attr.hex
new file mode 100644
index 00000000..f763d8c4
--- /dev/null
+++ b/internal/chstorage/_golden/col_json_lc_attr.hex
@@ -0,0 +1,8 @@
+00000000  03 06 00 00 00 00 00 00  04 00 00 00 00 00 00 00  |................|
+00000010  0b 7b 22 76 22 3a 22 66  6f 6f 22 7d 0b 7b 22 76  |.{"v":"foo"}.{"v|
+00000020  22 3a 22 62 61 72 22 7d  0b 7b 22 76 22 3a 22 62  |":"bar"}.{"v":"b|
+00000030  61 7a 22 7d 02 7b 7d 08  00 00 00 00 00 00 00 00  |az"}.{}.........|
+00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 01  |................|
+00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 02  |................|
+00000060  00 00 00 00 00 00 00 03  00 00 00 00 00 00 00 03  |................|
+00000070  00 00 00 00 00 00 00 03  00 00 00 00 00 00 00     |...............|
diff --git a/internal/chstorage/_golden/col_json_lc_attr.raw b/internal/chstorage/_golden/col_json_lc_attr.raw
new file mode 100644
index 00000000..96d26e97
Binary files /dev/null and b/internal/chstorage/_golden/col_json_lc_attr.raw differ