- Added :class:`.mysql.JSON` for MySQL 5.7. The JSON type provides

persistence of JSON values in MySQL as well as basic operator support
of "getitem" and "getpath", making use of the ``JSON_EXTRACT``
function in order to refer to individual paths in a JSON structure.
fixes #3547
- Added a new type to core :class:`.types.JSON`.  This is the
base of the PostgreSQL :class:`.postgresql.JSON` type as well as that
of the new :class:`.mysql.JSON` type, so that a PG/MySQL-agnostic
JSON column may be used.  The type features basic index and path
searching support.
fixes #3619
- reorganization of migration docs etc. to try to refer both to
the fixes to JSON that helps Postgresql while at the same time
indicating these are new features of the new base JSON type.
- a rework of the Array/Indexable system some more, moving things
that are specific to Array out of Indexable.
- new operators for JSON indexing added to core so that these can
be compiled by the PG and MySQL dialects individually
- rename sqltypes.Array to sqltypes.ARRAY - as there is no generic
Array implementation, this is an uppercase type for now, consistent
with the new sqltypes.JSON type that is also not a generic implementation.
There may need to be some convention change to handle the case of
datatypes that aren't generic, rely upon DB-native implementations,
but aren't necessarily all named the same thing.

1 files changed, 8 insertions, 5 deletions

diff --git a/lib/sqlalchemy/sql/elements.py b/lib/sqlalchemy/sql/elements.py
index 70046c66b..774e42609 100644
--- a/lib/sqlalchemy/sql/elements.py
+++ b/lib/sqlalchemy/sql/elements.py
@@ -682,9 +682,10 @@ class ColumnElement(operators.ColumnOperators, ClauseElement):
     def reverse_operate(self, op, other, **kwargs):
         return op(other, self.comparator, **kwargs)
 
-    def _bind_param(self, operator, obj):
+    def _bind_param(self, operator, obj, type_=None):
         return BindParameter(None, obj,
                              _compared_to_operator=operator,
+                             type_=type_,
                              _compared_to_type=self.type, unique=True)
 
     @property
@@ -1952,11 +1953,12 @@ class Tuple(ClauseList, ColumnElement):
     def _select_iterable(self):
         return (self, )
 
-    def _bind_param(self, operator, obj):
+    def _bind_param(self, operator, obj, type_=None):
         return Tuple(*[
             BindParameter(None, o, _compared_to_operator=operator,
-                          _compared_to_type=type_, unique=True)
-            for o, type_ in zip(obj, self._type_tuple)
+                          _compared_to_type=compared_to_type, unique=True,
+                          type_=type_)
+            for o, compared_to_type in zip(obj, self._type_tuple)
         ]).self_group()
 
 
@@ -3637,10 +3639,11 @@ class ColumnClause(Immutable, ColumnElement):
         else:
             return name
 
-    def _bind_param(self, operator, obj):
+    def _bind_param(self, operator, obj, type_=None):
         return BindParameter(self.key, obj,
                              _compared_to_operator=operator,
                              _compared_to_type=self.type,
+                             type_=type_,
                              unique=True)
 
     def _make_proxy(self, selectable, name=None, attach=True,