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new a19ff15 Add info about BaseOperatorMeta to UPDATING.md (#9369)
a19ff15 is described below
commit a19ff1572c68f5821e290a3cab6f2d3798e094b1
Author: Tomek Urbaszek <[email protected]>
AuthorDate: Thu Jun 18 13:49:44 2020 +0200
Add info about BaseOperatorMeta to UPDATING.md (#9369)
---
UPDATING.md | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/UPDATING.md b/UPDATING.md
index 01d69f0..a7fdcf2 100644
--- a/UPDATING.md
+++ b/UPDATING.md
@@ -62,7 +62,12 @@ https://developers.google.com/style/inclusive-documentation
-->
-### Not-nullable conn_type collumn in connection table
+### BaseOperator uses metaclass
+
+`BaseOperator` class uses a `BaseOperatorMeta` as a metaclass. This meta class
is based on
+`abc.ABCMeta`. If your custom operator uses different metaclass then you will
have to adjust it.
+
+### Not-nullable conn_type column in connection table
The `conn_type` column in the `connection` table must contain content.
Previously, this rule was enforced
by application logic, but was not enforced by the database schema.
