public TableMappingInterface::getExtraColumns($table_name)
Gets a list of extra database columns, which store denormalized data.
These database columns do not belong to any entity fields. Any normalized data that is stored should be associated with an entity field.
string $table_name: The name of the table to return the columns for.
string[] An array of column names for the given table.
public function getExtraColumns($table_name);
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