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Projection pushdown: Determine precise column usage of dataset transform pipelines #114

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jonmmease opened this issue May 26, 2022 · 0 comments · Fixed by #117
Closed

Projection pushdown: Determine precise column usage of dataset transform pipelines #114

jonmmease opened this issue May 26, 2022 · 0 comments · Fixed by #117

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@jonmmease
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As a follow-on to #113, there is the opportunity to improve projection pushdown by determining precise column usage of data transform pipelines. This is important when datasets are source derived from other datasets. Currently, the source dataset is assigned "unknown" usage in this situation, disabling projection pushdown.
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Detect precise column usage in data transforms and vlSelectionTest expressions vega/vegafusion
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@jonmmease