Exploring Type-Coercion And Value Comparisons In A JSON Column In MySQL 5.7.32

Exploring Type-Coercion And Value Comparisons In A JSON Column In MySQL 5.7.32

Exploring Type-Coercion And Value Comparisons In A JSON Column In MySQL 5.7.32. Ben Nadel continues to explore the JSON data-type in MySQL 5.7.32, looking at how type-coercion and value comparison operate within different inputs.

Generally speaking, SQL is pretty lenient when it comes to simple types and value comparisons. Meaning, from a SQL execution standpoint, 1 and "1" are equal because the SQL engine will coerce the values as needed (much like ColdFusion). However, document databases like MongoDB are much less lenient and will not cast values on-the-fly. This got me thinking about the new JSON support in MySQL 5.7: will simple values get coerced when comparing an input to a JSON path?

CAUTION: While MySQL will happily coerce values on-the-fly during a comparison, note that this does have implications. The most critical of which is that type coercion will bypass index selection during query planning which may result in a full-table scan.

When it comes to the JSON data structures in MySQL 5.7, you can "extract" a value using JSON_EXTRACT() (or ->); and then, you can "unquote" an extracted value using JSON_UNQUOTE() (or ->>). The latter of these two methods will remove the quotes ("") from an extracted String, which may or may not change the actual data-type of the resolved value. Before digging into value comparisons, it wasn't clear to me how all of this would come together.

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