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feat(storage): add table function clustering_statistics (#16081)
* add table function clustering_statistics * fix test
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198 changes: 198 additions & 0 deletions
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src/query/storages/fuse/src/table_functions/clustering_statistics/clustering_stat.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,198 @@ | ||
| // Copyright 2021 Datafuse Labs | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| use std::sync::Arc; | ||
|
|
||
| use databend_common_catalog::table::Table; | ||
| use databend_common_exception::Result; | ||
| use databend_common_expression::types::string::StringColumnBuilder; | ||
| use databend_common_expression::types::DataType; | ||
| use databend_common_expression::types::Int32Type; | ||
| use databend_common_expression::types::NumberDataType; | ||
| use databend_common_expression::types::StringType; | ||
| use databend_common_expression::BlockEntry; | ||
| use databend_common_expression::Column; | ||
| use databend_common_expression::DataBlock; | ||
| use databend_common_expression::FromData; | ||
| use databend_common_expression::Scalar; | ||
| use databend_common_expression::TableDataType; | ||
| use databend_common_expression::TableField; | ||
| use databend_common_expression::TableSchema; | ||
| use databend_common_expression::TableSchemaRefExt; | ||
| use databend_common_expression::Value; | ||
| use databend_storages_common_table_meta::meta::SegmentInfo; | ||
| use databend_storages_common_table_meta::meta::TableSnapshot; | ||
|
|
||
| use crate::io::SegmentsIO; | ||
| use crate::sessions::TableContext; | ||
| use crate::FuseTable; | ||
|
|
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| pub struct ClusteringStatistics<'a> { | ||
| pub ctx: Arc<dyn TableContext>, | ||
| pub table: &'a FuseTable, | ||
| pub limit: Option<usize>, | ||
| pub cluster_key_id: u32, | ||
| } | ||
|
|
||
| impl<'a> ClusteringStatistics<'a> { | ||
| pub fn new( | ||
| ctx: Arc<dyn TableContext>, | ||
| table: &'a FuseTable, | ||
| limit: Option<usize>, | ||
| cluster_key_id: u32, | ||
| ) -> Self { | ||
| Self { | ||
| ctx, | ||
| table, | ||
| limit, | ||
| cluster_key_id, | ||
| } | ||
| } | ||
|
|
||
| #[async_backtrace::framed] | ||
| pub async fn get_blocks(&self) -> Result<DataBlock> { | ||
| let tbl = self.table; | ||
| let maybe_snapshot = tbl.read_table_snapshot().await?; | ||
| if let Some(snapshot) = maybe_snapshot { | ||
| return self.to_block(snapshot).await; | ||
| } | ||
|
|
||
| Ok(DataBlock::empty_with_schema(Arc::new( | ||
| Self::schema().into(), | ||
| ))) | ||
| } | ||
|
|
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| #[async_backtrace::framed] | ||
| async fn to_block(&self, snapshot: Arc<TableSnapshot>) -> Result<DataBlock> { | ||
| let limit = self.limit.unwrap_or(usize::MAX); | ||
| let len = std::cmp::min(snapshot.summary.block_count as usize, limit); | ||
|
|
||
| let mut segment_name = Vec::with_capacity(len); | ||
| let mut block_name = StringColumnBuilder::with_capacity(len, len); | ||
| let mut max = Vec::with_capacity(len); | ||
| let mut min = Vec::with_capacity(len); | ||
| let mut level = Vec::with_capacity(len); | ||
| let mut pages = Vec::with_capacity(len); | ||
|
|
||
| let segments_io = SegmentsIO::create( | ||
| self.ctx.clone(), | ||
| self.table.operator.clone(), | ||
| self.table.schema(), | ||
| ); | ||
|
|
||
| let mut row_num = 0; | ||
| let mut end_flag = false; | ||
| let chunk_size = | ||
| std::cmp::min(self.ctx.get_settings().get_max_threads()? as usize * 4, len).max(1); | ||
|
|
||
| let format_vec = |v: &[Scalar]| -> String { | ||
| format!( | ||
| "[{}]", | ||
| v.iter() | ||
| .map(|item| format!("{}", item)) | ||
| .collect::<Vec<_>>() | ||
| .join(", ") | ||
| ) | ||
| }; | ||
| 'FOR: for chunk in snapshot.segments.chunks(chunk_size) { | ||
| let segments = segments_io | ||
| .read_segments::<SegmentInfo>(chunk, true) | ||
| .await?; | ||
| for (i, segment) in segments.into_iter().enumerate() { | ||
| let segment = segment?; | ||
| segment_name | ||
| .extend(std::iter::repeat(chunk[i].0.clone()).take(segment.blocks.len())); | ||
|
|
||
| for block in segment.blocks.iter() { | ||
| let block = block.as_ref(); | ||
| block_name.put_str(&block.location.0); | ||
| block_name.commit_row(); | ||
|
|
||
| let cluster_stats = block.cluster_stats.as_ref(); | ||
| let clustered = block | ||
| .cluster_stats | ||
| .as_ref() | ||
| .map_or(false, |v| v.cluster_key_id == self.cluster_key_id); | ||
| if clustered { | ||
| // Safe to unwrap | ||
| let cluster_stats = cluster_stats.unwrap(); | ||
| min.push(Some(format_vec(cluster_stats.min()))); | ||
| max.push(Some(format_vec(cluster_stats.max()))); | ||
| level.push(Some(cluster_stats.level)); | ||
| pages.push(cluster_stats.pages.as_ref().map(|v| format_vec(v))); | ||
| } else { | ||
| min.push(None); | ||
| max.push(None); | ||
| level.push(None); | ||
| pages.push(None); | ||
| } | ||
|
|
||
| row_num += 1; | ||
| if row_num >= limit { | ||
| end_flag = true; | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| if end_flag { | ||
| break 'FOR; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| Ok(DataBlock::new( | ||
| vec![ | ||
| BlockEntry::new( | ||
| DataType::String, | ||
| Value::Column(StringType::from_data(segment_name)), | ||
| ), | ||
| BlockEntry::new( | ||
| DataType::String, | ||
| Value::Column(Column::String(block_name.build())), | ||
| ), | ||
| BlockEntry::new( | ||
| DataType::String.wrap_nullable(), | ||
| Value::Column(StringType::from_opt_data(min)), | ||
| ), | ||
| BlockEntry::new( | ||
| DataType::String.wrap_nullable(), | ||
| Value::Column(StringType::from_opt_data(max)), | ||
| ), | ||
| BlockEntry::new( | ||
| DataType::Number(NumberDataType::Int32).wrap_nullable(), | ||
| Value::Column(Int32Type::from_opt_data(level)), | ||
| ), | ||
| BlockEntry::new( | ||
| DataType::String.wrap_nullable(), | ||
| Value::Column(StringType::from_opt_data(pages)), | ||
| ), | ||
| ], | ||
| row_num, | ||
| )) | ||
| } | ||
|
|
||
| pub fn schema() -> Arc<TableSchema> { | ||
| TableSchemaRefExt::create(vec![ | ||
| TableField::new("segment_name", TableDataType::String), | ||
| TableField::new("block_name", TableDataType::String), | ||
| TableField::new("min", TableDataType::String.wrap_nullable()), | ||
| TableField::new("max", TableDataType::String.wrap_nullable()), | ||
| TableField::new( | ||
| "level", | ||
| TableDataType::Number(NumberDataType::Int32).wrap_nullable(), | ||
| ), | ||
| TableField::new("pages", TableDataType::String.wrap_nullable()), | ||
| ]) | ||
| } | ||
| } |
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