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dbt-core/.changes/unreleased/Features-20241121-125630.yaml
Quigley Malcolm c3d87b89fb Add batch context object to microbatch jinja context (#11031)
* Add `batch_id` to jinja context of microbatch batches

* Add changie doc

* Update `format_batch_start` to assume `batch_start` is always provided

* Add "runtime only" property `batch_context` to `ModelNode`

By it being "runtime only" we mean that it doesn't exist on the artifact
and thus won't be written out to the manifest artifact.

* Begin populating `batch_context` during materialization execution for microbatch batches

* Fix circular import

* Fixup MicrobatchBuilder.batch_id property method

* Ensure MicrobatchModelRunner doesn't double compile batches

We were compiling the node for each batch _twice_. Besides making microbatch
models more expensive than they needed to be, double compiling wasn't
causing any issue. However the first compilation was happening _before_ we
had added the batch context information to the model node for the batch. This
was leading to models which try to access the `batch_context` information on the
model to blow up, which was undesirable. As such, we've now gone and skipped
the first compilation. We've done this similar to how SavedQuery nodes skip
compilation.

* Add `__post_serialize__` method to `BatchContext` to ensure correct dict shape

This is weird, but necessary, I apologize. Mashumaro handles the
dictification of this class via a compile time generated `to_dict`
method based off of the _typing_ of th class. By default `datetime`
types are converted to strings. We don't want that, we want them to
stay datetimes.

* Update tests to check for `batch_context`

* Update `resolve_event_time_filter` to use new `batch_context`

* Stop testing for batchless compiled code for microbatch models

In 45daec72f4 we stopped an extra compilation
that was happening per batch prior to the batch_context being loaded. Stopping
this extra compilation means that compiled sql for the microbatch model without
the event time filter / batch context is no longer produced. We have discussed
this and _believe_ it is okay given that this is a new node type that has not
hit GA yet.

* Rename `ModelNode.batch_context` to `ModelNode.batch`

* Rename `build_batch_context` to `build_jinja_context_for_batch`

The name `build_batch_context` was confusing as
1) We have a `BatchContext` object, which the method was not building
2) The method builds the jinja context for the batch
As such it felt appropriate to rename the method to more accurately
communicate what it does.

* Rename test macro `invalid_batch_context_macro_sql` to `invalid_batch_jinja_context_macro_sql`

This rename was to make it more clear that the jinja context for a
batch was being checked, as a batch_context has a slightly different
connotation.

* Update changie doc
2024-11-27 16:06:41 -06:00

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YAML

kind: Features
body: Add `batch` context object to model jinja context
time: 2024-11-21T12:56:30.715473-06:00
custom:
Author: QMalcolm
Issue: "11025"