fix(oracle): disable statement cache

Oracle really doesn't like to "re" prepare a statement, which means
attempting to execute two bound expressions in succession with the same
name will usual fail, or "work" in unexpected ways.

https://python-oracledb.readthedocs.io/en/latest/user_guide/appendix_b.html#statement-caching-in-thin-and-thick-modes
https://python-oracledb.readthedocs.io/en/latest/user_guide/tuning.html#setting-the-statement-cache

We set the cache to size 0 to disable it to avoid these shenanigans.

ibis/backends/oracle/__init__.py

@@ -127,7 +127,12 @@ def do_connect(
         engine = sa.create_engine(
             url,
             poolclass=sa.pool.StaticPool,
-            connect_args={"service_name": database},
+            # We set the statement cache size to 0 because Oracle will otherwise
+            # attempt to reuse prepared statements even if the type of the bound variable
+            # has changed.
+            # This is apparently accepted behavior.
+            # https://python-oracledb.readthedocs.io/en/latest/user_guide/appendix_b.html#statement-caching-in-thin-and-thick-modes
+            connect_args={"service_name": database, "stmtcachesize": 0},
         )
 
         super().do_connect(engine)