first part of columnar prototype (ATLASG-2853) (!78090) · Merge requests · atlas / athena

The columnar prototype is laid out in these two presentations:

The full prototype can be found here: https://gitlab.cern.ch/atlas-asg/columnar-athena/-/tree/columnar/PhysicsAnalysis/Columnar

The branch also contains all tool conversions we have so far, including some partial tool conversions. This initial MR tries to have a minimal subset of the prototype:

ColumnarBase base class for tools
ColumnAccessor for accessing simple POD columns
ObjectColumn-ColumnAccessor for accessing objects from event store: this is needed for actual columnar tools in Array mode, as they can't otherwise implement the top-level function callEvents.
ColumnarExampleTools: a few example tools that show common variations of how CP tools access POD columns
ColumnarInterfaces: the interface for columnar tools in Array mode
ColumnarEventInfo: this contains the definition of EventInfo, as that is needed for some tests

Parts that were truncated/removed and will come in later MRs:

all of the actual CP tool migrations
the definitions and special accessors for all the xAOD types (beyond the definition for EventInfo)
all the other ColumnAccessor implementations, e.g. for ElementLink and vectors
ColumnInfo members only needed for those accessors
the software stack for using columnar tools in Array mode
any tests that rely on that software stack in Array mode
the python language bindings in array mode

first part of columnar prototype (ATLASG-2853)

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