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Use delta encoding for timestamp #341

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Merged
merged 1 commit into from
Mar 13, 2023
Merged

Use delta encoding for timestamp #341

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9 changes: 8 additions & 1 deletion server/src/storage/object_storage.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,10 @@ use crate::{
use actix_web_prometheus::PrometheusMetrics;
use async_trait::async_trait;
use bytes::Bytes;
use datafusion::arrow::datatypes::Schema;
use datafusion::{
arrow::datatypes::Schema,
parquet::{basic::Encoding, schema::types::ColumnPath},
};
use datafusion::{
arrow::{
array::TimestampMillisecondArray, ipc::reader::StreamReader, record_batch::RecordBatch,
Expand Down Expand Up @@ -324,6 +327,10 @@ pub trait ObjectStorage: Sync + 'static {
let props = WriterProperties::builder()
.set_max_row_group_size(CONFIG.parseable.row_group_size)
.set_compression(CONFIG.parseable.parquet_compression.into())
.set_column_encoding(
ColumnPath::new(vec!["p_timestamp".to_string()]),
Encoding::DELTA_BINARY_PACKED,
)
.build();
let schema = Arc::new(record_reader.merged_schema());
let mut writer = ArrowWriter::try_new(parquet_file, schema.clone(), Some(props))?;
Expand Down