Split the sub-paths to a whole path For example: 1) ["id"] -> "id" 2) ["id", "a"] -> "id.a" 3) ["x.y", "z"] -> "`x.y`.z" ..

Escaped: 1) x.y -> `x.y` 2) `x.y`.a -> `\`x.y\`.a` 3) `x.y``.a -> `\`x.y\`\`.a` (special case) No Escape: 4) x -> x 5) `x.y` -> `x.y` 6) `x.y`a -> `x.y`a.

For example: '{"id": 1, "obj.x": "abc", "obj.y": 2}' -> '{"id": 1, "obj": { "x": "abc", "y": 2}}'.

Split the json path to sub-paths For example: 1) "id" -> ["id"] 2) "id.a" -> ["id", "a"] 3) "`x.y`.z" -> ["x.y", "z"] ..

Unescaped: 1) `x.y` -> x.y 2) `\`x.y\`.a` -> `x.y`.a No unescape: 3) x -> x 4) `x.y`.a -> `x.y`.a 5) \`x.y\`.a -> \`x.y\`.a 6) `x.y`.a` -> `x.y`.a` (special case) 7) `` -> `` (special case).

https://github.com/ClickHouse/ClickHouse/blob/master/src/Columns/ColumnLowCardinality.cpp https://github.com/ClickHouse/proton-cpp/blob/master/proton/columns/lowcardinality.cpp.

https://github.com/ClickHouse/ClickHouse/blob/master/src/Columns/ColumnMap.cpp.