On Wed, Jun 13, 2018 at 7:44 PM, Peter Lai <peter....@pw.utc.com> wrote: > I've implemented a Concrete inheritance model and Oracle 11g is balking on > `CAST(NULL AS CLOB) as fieldn` during the pjoin union query execution with: > > ORA-00932: inconsistent datatypes: expected - got CLOB > > This happens when the unioned tables representing the 2 subclasses have > different `Text` fields which are created as CLOBs on Oracle. This is > independent of cxOracle version, since we get the same problem running the > emitted query in native Oracle SQL Developer: > > `select cast(null as clob) from dual` > > ORA-00932: inconsistent datatypes: expected - got CLOB > 00932. 00000 - "inconsistent datatypes: expected %s got %s" > *Cause: > *Action: > Error at Line: 1 Column: 8 > > The rest of the CASTs of NULL work fine, though, but generally NULL columns > should have no datatype in Oracle via NULL definition. I am on SQLAlchemy > 1.1.3. Does 1.2x handle this better? If yes, and I need to hotpatch, which > lines would I need to patch?
just turn them off: http://docs.sqlalchemy.org/en/rel_1_1/orm/mapping_api.html?highlight=polymorphic_union#sqlalchemy.orm.util.polymorphic_union.params.cast_nulls cast_nulls¶ – if True, non-existent columns, which are represented as labeled NULLs, will be passed into CAST. This is a legacy behavior that is problematic on some backends such as Oracle - in which case it can be set to False. > > -- > SQLAlchemy - > The Python SQL Toolkit and Object Relational Mapper > > http://www.sqlalchemy.org/ > > To post example code, please provide an MCVE: Minimal, Complete, and > Verifiable Example. See http://stackoverflow.com/help/mcve for a full > description. > --- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+unsubscr...@googlegroups.com. > To post to this group, send email to sqlalchemy@googlegroups.com. > Visit this group at https://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
