From 670cd279ea7789e07b6d778a21fdec68347ab305 Mon Sep 17 00:00:00 2001 From: Fabian Mastenbroek Date: Mon, 2 May 2022 14:17:55 +0200 Subject: 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. --- .../src/main/kotlin/org/opendc/trace/internal/TableImpl.kt | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/internal') diff --git a/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/internal/TableImpl.kt b/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/internal/TableImpl.kt index 24551edb..b848e19a 100644 --- a/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/internal/TableImpl.kt +++ b/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/internal/TableImpl.kt @@ -43,7 +43,9 @@ internal class TableImpl(val trace: TraceImpl, override val name: String) : Tabl override val partitionKeys: List> get() = details.partitionKeys - override fun newReader(): TableReader = trace.format.newReader(trace.path, name) + override fun newReader(projection: List>?): TableReader { + return trace.format.newReader(trace.path, name, projection) + } override fun newWriter(): TableWriter = trace.format.newWriter(trace.path, name) -- cgit v1.2.3