metabase.query-processor.middleware.fetch-source-query
Middleware responsible for 'hydrating' the source query for queries that use another query as their source. This middleware looks for MBQL queries like
{:source-table "card__1" ; Shorthand for using Card 1 as source query ...}
and resolves the referenced source query, transforming the query to look like the following:
{:source-query {...} ; Query for Card 1 :source-metadata [...] ; metadata about columns in Card 1 ...}
This middleware resolves Card ID :source-tables at all levels of the query, but the top-level query often uses the
so-called virtual-id, because the frontend client might not know the original Database; this middleware will
replace that ID with the approiate ID, e.g.
{:database <virtual-id>, :type :query, :query {:source-table "card__1"}} -> {:database 1, :type :query, :query {:source-query {...}, :source-metadata {...}}}
TODO - consider renaming this namespace to metabase.query-processor.middleware.resolve-card-id-source-tables
Middleware responsible for 'hydrating' the source query for queries that use another query as their source. This
middleware looks for MBQL queries like
{:source-table "card__1" ; Shorthand for using Card 1 as source query
...}
and resolves the referenced source query, transforming the query to look like the following:
{:source-query {...} ; Query for Card 1
:source-metadata [...] ; metadata about columns in Card 1
...}
This middleware resolves Card ID `:source-table`s at all levels of the query, but the top-level query often uses the
so-called `virtual-id`, because the frontend client might not know the original Database; this middleware will
replace that ID with the approiate ID, e.g.
{:database <virtual-id>, :type :query, :query {:source-table "card__1"}}
->
{:database 1, :type :query, :query {:source-query {...}, :source-metadata {...}}}
TODO - consider renaming this namespace to `metabase.query-processor.middleware.resolve-card-id-source-tables`resolve-card-id-source-tablesclj
(resolve-card-id-source-tables qp)Middleware that assocs the :source-query for this query if it was specified using the shorthand :source-table
card__n format.
Middleware that assocs the `:source-query` for this query if it was specified using the shorthand `:source-table` `card__n` format.
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