Raw tables: Support rest column #158
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This adds support for the
Restcolumn described in the Raw Tables roadmap.When the
Restcolumn is used, we create a set of all other columns matched in a statement. During the sync process, we then match over the received row and build a JSON object containing values from the source row that aren't matched by a column in the raw table.Having a rest column in the raw table can help with some migrations that add columns, because synced values would be available in that table without having to re-sync.