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) Co-authored-by: Eric Fu <[email protected]>
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173
src/frontend/src/optimizer/plan_node/generic/cdc_scan.rs
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| // Copyright 2023 RisingWave 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::rc::Rc; | ||
|
|
||
| use educe::Educe; | ||
| use fixedbitset::FixedBitSet; | ||
| use pretty_xmlish::Pretty; | ||
| use risingwave_common::catalog::{CdcTableDesc, ColumnDesc, Field, Schema}; | ||
| use risingwave_common::util::column_index_mapping::ColIndexMapping; | ||
| use risingwave_common::util::sort_util::ColumnOrder; | ||
|
|
||
| use super::GenericPlanNode; | ||
| use crate::catalog::ColumnId; | ||
| use crate::expr::ExprRewriter; | ||
| use crate::optimizer::optimizer_context::OptimizerContextRef; | ||
| use crate::optimizer::property::FunctionalDependencySet; | ||
|
|
||
| /// [`CdcScan`] reads rows of a table from an external upstream database | ||
| #[derive(Debug, Clone, Educe)] | ||
| #[educe(PartialEq, Eq, Hash)] | ||
| pub struct CdcScan { | ||
| pub table_name: String, | ||
| /// Include `output_col_idx` and columns required in `predicate` | ||
| pub output_col_idx: Vec<usize>, | ||
| /// Descriptor of the external table for CDC | ||
| pub cdc_table_desc: Rc<CdcTableDesc>, | ||
| #[educe(PartialEq(ignore))] | ||
| #[educe(Hash(ignore))] | ||
| pub ctx: OptimizerContextRef, | ||
| } | ||
|
|
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| impl CdcScan { | ||
| pub fn rewrite_exprs(&self, _rewriter: &mut dyn ExprRewriter) {} | ||
|
|
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| /// Get the ids of the output columns. | ||
| pub fn output_column_ids(&self) -> Vec<ColumnId> { | ||
| self.output_col_idx | ||
| .iter() | ||
| .map(|i| self.get_table_columns()[*i].column_id) | ||
| .collect() | ||
| } | ||
|
|
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| pub fn primary_key(&self) -> &[ColumnOrder] { | ||
| &self.cdc_table_desc.pk | ||
| } | ||
|
|
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| pub fn watermark_columns(&self) -> FixedBitSet { | ||
| FixedBitSet::with_capacity(self.get_table_columns().len()) | ||
| } | ||
|
|
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| pub(crate) fn column_names_with_table_prefix(&self) -> Vec<String> { | ||
| self.output_col_idx | ||
| .iter() | ||
| .map(|&i| format!("{}.{}", self.table_name, self.get_table_columns()[i].name)) | ||
| .collect() | ||
| } | ||
|
|
||
| pub(crate) fn column_names(&self) -> Vec<String> { | ||
| self.output_col_idx | ||
| .iter() | ||
| .map(|&i| self.get_table_columns()[i].name.clone()) | ||
| .collect() | ||
| } | ||
|
|
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| /// get the Mapping of columnIndex from internal column index to output column index | ||
| pub fn i2o_col_mapping(&self) -> ColIndexMapping { | ||
| ColIndexMapping::with_remaining_columns( | ||
| &self.output_col_idx, | ||
| self.get_table_columns().len(), | ||
| ) | ||
| } | ||
|
|
||
| /// Get the ids of the output columns and primary key columns. | ||
| pub fn output_and_pk_column_ids(&self) -> Vec<ColumnId> { | ||
| let mut ids = self.output_column_ids(); | ||
| for column_order in self.primary_key() { | ||
| let id = self.get_table_columns()[column_order.column_index].column_id; | ||
| if !ids.contains(&id) { | ||
| ids.push(id); | ||
| } | ||
| } | ||
| ids | ||
| } | ||
|
|
||
| /// Create a logical scan node for CDC backfill | ||
| pub(crate) fn new( | ||
| table_name: String, | ||
| output_col_idx: Vec<usize>, // the column index in the table | ||
| cdc_table_desc: Rc<CdcTableDesc>, | ||
| ctx: OptimizerContextRef, | ||
| ) -> Self { | ||
| Self { | ||
| table_name, | ||
| output_col_idx, | ||
| cdc_table_desc, | ||
| ctx, | ||
| } | ||
| } | ||
|
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| pub(crate) fn columns_pretty<'a>(&self, verbose: bool) -> Pretty<'a> { | ||
| Pretty::Array( | ||
| match verbose { | ||
| true => self.column_names_with_table_prefix(), | ||
| false => self.column_names(), | ||
| } | ||
| .into_iter() | ||
| .map(Pretty::from) | ||
| .collect(), | ||
| ) | ||
| } | ||
| } | ||
|
|
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| // TODO: extend for cdc table | ||
| impl GenericPlanNode for CdcScan { | ||
| fn schema(&self) -> Schema { | ||
| let fields = self | ||
| .output_col_idx | ||
| .iter() | ||
| .map(|tb_idx| { | ||
| let col = &self.get_table_columns()[*tb_idx]; | ||
| Field::from_with_table_name_prefix(col, &self.table_name) | ||
| }) | ||
| .collect(); | ||
| Schema { fields } | ||
| } | ||
|
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| fn stream_key(&self) -> Option<Vec<usize>> { | ||
| Some(self.cdc_table_desc.stream_key.clone()) | ||
| } | ||
|
|
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| fn ctx(&self) -> OptimizerContextRef { | ||
| self.ctx.clone() | ||
| } | ||
|
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| fn functional_dependency(&self) -> FunctionalDependencySet { | ||
| let pk_indices = self.stream_key(); | ||
| let col_num = self.output_col_idx.len(); | ||
| match &pk_indices { | ||
| Some(pk_indices) => FunctionalDependencySet::with_key(col_num, pk_indices), | ||
| None => FunctionalDependencySet::new(col_num), | ||
| } | ||
| } | ||
| } | ||
|
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| impl CdcScan { | ||
| pub fn get_table_columns(&self) -> &[ColumnDesc] { | ||
| &self.cdc_table_desc.columns | ||
| } | ||
|
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| pub fn append_only(&self) -> bool { | ||
| false | ||
| } | ||
|
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| /// Get the descs of the output columns. | ||
| pub fn column_descs(&self) -> Vec<ColumnDesc> { | ||
| self.output_col_idx | ||
| .iter() | ||
| .map(|&i| self.get_table_columns()[i].clone()) | ||
| .collect() | ||
| } | ||
| } |
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