cartodb4/cartodb-postgresql
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Make CDB_Get_Foreign_Updated_At robust to missing CDB_TableMetadata

Browse Source 
This may happen with non-carto DB's, when checking the updated_at
times and not finding the corresponding remote.cdb_tablemetadata
imported from the foreign non-carto DB.

Instead of failing, return a NOW() timestampt, so that caching logic
just assumes there may have been changes.

This makes it work today, and leaves open the possibility of adding
the required carto metadata for homogeneous caching in the future.
This commit is contained in:
Rafa de la Torre 2019-06-28 14:52:37 +02:00
parent 2e665a56b4
commit c06d24aa19
1 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
scripts-available/CDB_ForeignTable.sql
View File

@ -125,7 +125,15 @@ BEGIN
-- We assume that the remote cdb_tablemetadata is called cdb_tablemetadata and is on the same schema as the queried table.
SELECT nspname FROM pg_class c, pg_namespace n WHERE c.oid=foreign_table AND c.relnamespace = n.oid INTO fdw_schema_name;
EXECUTE FORMAT('SELECT updated_at FROM %I.cdb_tablemetadata WHERE tabname=%L ORDER BY updated_at DESC LIMIT 1', fdw_schema_name, remote_table_name) INTO time;
BEGIN
EXECUTE FORMAT('SELECT updated_at FROM %I.cdb_tablemetadata WHERE tabname=%L ORDER BY updated_at DESC LIMIT 1', fdw_schema_name, remote_table_name) INTO time;
EXCEPTION
WHEN undefined_table THEN
-- If you add a GET STACKED DIAGNOSTICS text_var = RETURNED_SQLSTATE
-- you get a code 42P01 which corresponds to undefined_table
RAISE NOTICE 'CDB_Get_Foreign_Updated_At: could not find %.cdb_tablemetadata while checking % updated_at, returning NOW() timestamp', fdw_schema_name, foreign_table;
time := NOW();
END;
RETURN time;
END
$$