Syntax:
column->path

In MySQL 5.7.9 and later, the -> operator serves as an alias for the
JSON_EXTRACT() function when used with two arguments, a column
identifier on the left and a JSON path (a string literal) on the right
that is evaluated against the JSON document (the column value). You can
use such expressions in place of column references wherever they occur
in SQL statements.

URL: https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html

