Add RecordBatch::ensure_schema for schema evolution#9798
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huymq1710 wants to merge 1 commit intoapache:mainfrom
Open
Add RecordBatch::ensure_schema for schema evolution#9798huymq1710 wants to merge 1 commit intoapache:mainfrom
RecordBatch::ensure_schema for schema evolution#9798huymq1710 wants to merge 1 commit intoapache:mainfrom
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huymq1710
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RecordBatch::ensure_schema for schema evolutioRecordBatch::ensure_schema for schema evolution
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Which issue does this PR close?
Rationale for this change
When Schema evolution happen, a table's schema may have columns that do not appear in individual
RecordBatches (e.g. older Parquet files missing columns added later). Query engines like DataFusion and Iceberg need to expand old batches withnullvalues to align them to a merged schemaWhat changes are included in this PR?
Add
RecordBatch::ensure_schema(target_schema)— a stateless method that adapts a batch to a target schemI follows the InfluxDB approach:
https://github.com/influxdata/influxdb3_core/blob/0f5ecbd6b17f83f7ad4ba55699fc2cd3e151cf94/arrow_util/src/util.rs#L28-L47
A
SchemaMapperfor repeated application (pre-computed mapping) will follow in a separate PRAre these changes tested?
Are there any user-facing changes?
New public method
RecordBatch::ensure_schemaonarrow-array