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| author | Fabian Mastenbroek <mail.fabianm@gmail.com> | 2022-05-02 14:17:55 +0200 |
|---|---|---|
| committer | Fabian Mastenbroek <mail.fabianm@gmail.com> | 2022-05-02 15:37:04 +0200 |
| commit | 670cd279ea7789e07b6d778a21fdec68347ab305 (patch) | |
| tree | df91a7fd81a5d1afc51a0380fd938adf701bc43b /opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/Table.kt | |
| parent | 9411845b3f26536a1e6ea40504e396f19d25a09a (diff) | |
feat(trace/api): Add support for projecting tables
This change adds support for projecting certain columns of a table. This
enables faster reading for tables with high number of columns.
Currently, we support projection in the Parquet-based workload formats.
Other formats are text-based and will probably not benefit much from
projection.
Diffstat (limited to 'opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/Table.kt')
| -rw-r--r-- | opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/Table.kt | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/Table.kt b/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/Table.kt index b0181cbc..05d0234a 100644 --- a/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/Table.kt +++ b/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/Table.kt @@ -42,9 +42,11 @@ public interface Table { public val partitionKeys: List<TableColumn<*>> /** - * Open a [TableReader] for this table. + * Open a [TableReader] for a projection of this table. + * + * @param projection The list of columns to fetch from the table or `null` if no projection is performed. */ - public fun newReader(): TableReader + public fun newReader(projection: List<TableColumn<*>>? = null): TableReader /** * Open a [TableWriter] for this table. |