Boolean values not supported as argument for Spanner

[michael-the-grey]

The function ParseValExpr, does not have a case for booleans and throws the error "unsupported value expression". Definition found here.

https://github.com/tcncloud/protoc-gen-persist/blob/master/generator/spanner_args.go#L46

Fails on insert

INSERT INTO table_name (table_name_id, bool_field) VALUES(?, true)

Also fails on updates

UPDATE table_name set bool_field=true WHERE table_name_id = ?

[iamneal]

fixed with the new query parser