john-bodley commented on code in PR #22413:
URL: https://github.com/apache/superset/pull/22413#discussion_r1048009815
##########
superset/connectors/sqla/models.py:
##########
@@ -224,10 +224,10 @@ class TableColumn(Model, BaseColumn, CertificationMixin):
__tablename__ = "table_columns"
__table_args__ = (UniqueConstraint("table_id", "column_name"),)
table_id = Column(Integer, ForeignKey("tables.id"))
- table: SqlaTable = relationship(
+ table = relationship(
"SqlaTable",
- backref=backref("columns", cascade="all, delete-orphan"),
- foreign_keys=[table_id],
+ back_populates="columns",
+ lazy="joined", # Eager loading for efficient parent referencing.
Review Comment:
The default is `lazy="select"` which results in lazy loading and [N
+1](https://docs.sqlalchemy.org/en/14/glossary.html#term-N-plus-one-problem)
`SELECT` statements.
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