refactor(planner): Move all metadata out

Cargo.toml

@@ -30,6 +30,7 @@ members = [
     "src/query/functions-v2",
     "src/query/legacy-parser",
     "src/query/management",
+    "src/query/planner",
     "src/query/pipeline/core",
     "src/query/pipeline/sinks",
     "src/query/pipeline/sources",

src/query/planner/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "common-planner"
+version = "0.1.0"
+authors = ["Databend Authors <opensource@datafuselabs.com>"]
+license = "Apache-2.0"
+publish = false
+edition = "2021"
+
+[dependencies]
+common-catalog = { path = "../catalog" }
+common-datavalues = { path = "../datavalues" }
+
+parking_lot = "0.12"

src/query/planner/src/lib.rs

@@ -0,0 +1,31 @@
+// Copyright 2022 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.
+
+//! Databend Planner is the core part of Databend Query, it will:
+//!
+//! - Use `Parser` (provided by `common-ast`) to parse query into AST.
+//! - Use `Binder` to bind query into `LogicalPlan`
+//! - Use `Optimizer` to optimize `LogicalPlan` into `PhysicalPlan`
+//!
+//! After all the planners work, `Interpreter` will use `PhysicalPlan` to
+//! build pipelines, then our processes will produce result data blocks.
+
+mod metadata;
+pub use metadata::ColumnEntry;
+pub use metadata::ColumnSet;
+pub use metadata::IndexType;
+pub use metadata::Metadata;
+pub use metadata::MetadataRef;
+pub use metadata::TableEntry;
+pub use metadata::DUMMY_TABLE_INDEX;

src/query/planner/src/metadata.rs

@@ -0,0 +1,318 @@
+// Copyright 2022 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::collections::HashSet;
+use std::collections::VecDeque;
+use std::fmt::Debug;
+use std::fmt::Formatter;
+use std::sync::Arc;
+
+use common_catalog::table::Table;
+use common_datavalues::DataField;
+use common_datavalues::DataType;
+use common_datavalues::DataTypeImpl;
+use common_datavalues::StructType;
+use common_datavalues::TypeID;
+use parking_lot::RwLock;
+
+/// Planner use [`usize`] as it's index type.
+///
+/// This type will be used across the whole planner.
+pub type IndexType = usize;
+
+/// Use IndexType::MAX to represent dummy table.
+pub static DUMMY_TABLE_INDEX: IndexType = IndexType::MAX;
+
+/// ColumnSet represents a set of columns identified by its IndexType.
+pub type ColumnSet = HashSet<IndexType>;
+
+/// A Send & Send version of [`Metadata`].
+///
+/// Callers can clone this ref safely and cheaply.
+pub type MetadataRef = Arc<RwLock<Metadata>>;
+
+/// Metadata stores information about columns and tables used in a query.
+/// Tables and columns are identified with its unique index.
+/// Notice that index value of a column can be same with that of a table.
+#[derive(Clone, Debug, Default)]
+pub struct Metadata {
+    tables: Vec<TableEntry>,
+    columns: Vec<ColumnEntry>,
+}
+
+impl Metadata {
+    pub fn table(&self, index: IndexType) -> &TableEntry {
+        self.tables.get(index).expect("metadata must contain table")
+    }
+
+    pub fn tables(&self) -> &[TableEntry] {
+        self.tables.as_slice()
+    }
+
+    pub fn table_index_by_column_indexes(&self, column_indexes: &ColumnSet) -> Option<IndexType> {
+        self.columns
+            .iter()
+            .find(|v| column_indexes.contains(&v.column_index))
+            .and_then(|v| v.table_index)
+    }
+
+    pub fn column(&self, index: IndexType) -> &ColumnEntry {
+        self.columns
+            .get(index)
+            .expect("metadata must contain column")
+    }
+
+    pub fn columns(&self) -> &[ColumnEntry] {
+        self.columns.as_slice()
+    }
+
+    pub fn columns_by_table_index(&self, index: IndexType) -> Vec<ColumnEntry> {
+        self.columns
+            .iter()
+            .filter(|v| v.table_index == Some(index))
+            .cloned()
+            .collect()
+    }
+
+    pub fn add_column(
+        &mut self,
+        name: String,
+        data_type: DataTypeImpl,
+        table_index: Option<IndexType>,
+        path_indices: Option<Vec<IndexType>>,
+    ) -> IndexType {
+        let column_index = self.columns.len();
+        let column_entry =
+            ColumnEntry::new(name, data_type, column_index, table_index, path_indices);
+        self.columns.push(column_entry);
+        column_index
+    }
+
+    pub fn add_table(
+        &mut self,
+        catalog: String,
+        database: String,
+        table_meta: Arc<dyn Table>,
+    ) -> IndexType {
+        let table_name = table_meta.name().to_string();
+        let table_index = self.tables.len();
+        let table_entry = TableEntry {
+            index: table_index,
+            name: table_name,
+            database,
+            catalog,
+            table: table_meta.clone(),
+        };
+        self.tables.push(table_entry);
+        let mut struct_fields = VecDeque::new();
+        for (i, field) in table_meta.schema().fields().iter().enumerate() {
+            self.add_column(
+                field.name().clone(),
+                field.data_type().clone(),
+                Some(table_index),
+                None,
+            );
+            if field.data_type().data_type_id() == TypeID::Struct {
+                struct_fields.push_back((vec![i], field.clone()));
+            }
+        }
+        // add inner columns of struct column
+        while !struct_fields.is_empty() {
+            let (path_indices, field) = struct_fields.pop_front().unwrap();
+            let struct_type: StructType = field.data_type().clone().try_into().unwrap();
+
+            let inner_types = struct_type.types();
+            let inner_names = match struct_type.names() {
+                Some(inner_names) => inner_names
+                    .iter()
+                    .map(|name| format!("{}:{}", field.name(), name))
+                    .collect::<Vec<_>>(),
+                None => (0..inner_types.len())
+                    .map(|i| format!("{}:{}", field.name(), i))
+                    .collect::<Vec<_>>(),
+            };
+            for ((i, inner_name), inner_type) in
+                inner_names.into_iter().enumerate().zip(inner_types.iter())
+            {
+                let mut inner_path_indices = path_indices.clone();
+                inner_path_indices.push(i);
+
+                self.add_column(
+                    inner_name.clone(),
+                    inner_type.clone(),
+                    Some(table_index),
+                    Some(inner_path_indices.clone()),
+                );
+                if inner_type.data_type_id() == TypeID::Struct {
+                    let inner_field = DataField::new(&inner_name, inner_type.clone());
+                    struct_fields.push_back((inner_path_indices, inner_field));
+                }
+            }
+        }
+        table_index
+    }
+
+    pub fn find_smallest_column_within(&self, indices: &[usize]) -> usize {
+        let entries = indices
+            .iter()
+            .map(|i| self.column(*i).clone())
+            .collect::<Vec<_>>();
+        find_smallest_column(entries.as_slice())
+    }
+}
+
+#[derive(Clone)]
+pub struct TableEntry {
+    catalog: String,
+    database: String,
+    name: String,
+    index: IndexType,
+
+    table: Arc<dyn Table>,
+}
+
+impl Debug for TableEntry {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("TableEntry")
+            .field("catalog", &self.catalog)
+            .field("database", &self.database)
+            .field("name", &self.name)
+            .field("index", &self.index)
+            .finish_non_exhaustive()
+    }
+}
+
+impl TableEntry {
+    pub fn new(
+        index: IndexType,
+        name: String,
+        catalog: String,
+        database: String,
+        table: Arc<dyn Table>,
+    ) -> Self {
+        TableEntry {
+            index,
+            name,
+            catalog,
+            database,
+            table,
+        }
+    }
+
+    /// Get the catalog name of this table entry.
+    pub fn catalog(&self) -> &str {
+        &self.catalog
+    }
+
+    /// Get the database name of this table entry.
+    pub fn database(&self) -> &str {
+        &self.database
+    }
+
+    /// Get the name of this table entry.
+    pub fn name(&self) -> &str {
+        &self.name
+    }
+
+    /// Get the index this table entry.
+    pub fn index(&self) -> IndexType {
+        self.index
+    }
+
+    /// Get the table of this table entry.
+    pub fn table(&self) -> Arc<dyn Table> {
+        self.table.clone()
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct ColumnEntry {
+    column_index: IndexType,
+    name: String,
+    data_type: DataTypeImpl,
+
+    /// Table index of column entry. None if column is derived from a subquery.
+    table_index: Option<IndexType>,
+    /// Path indices for inner column of struct data type.
+    path_indices: Option<Vec<IndexType>>,
+}
+
+impl ColumnEntry {
+    pub fn new(
+        name: String,
+        data_type: DataTypeImpl,
+        column_index: IndexType,
+        table_index: Option<IndexType>,
+        path_indices: Option<Vec<IndexType>>,
+    ) -> Self {
+        ColumnEntry {
+            column_index,
+            name,
+            data_type,
+            table_index,
+            path_indices,
+        }
+    }
+
+    /// Get the name of this column entry.
+    pub fn name(&self) -> &str {
+        &self.name
+    }
+
+    /// Get the index of this column entry.
+    pub fn index(&self) -> IndexType {
+        self.column_index
+    }
+
+    /// Get the data type of this column entry.
+    pub fn data_type(&self) -> &DataTypeImpl {
+        &self.data_type
+    }
+
+    /// Get the table index of this column entry.
+    pub fn table_index(&self) -> Option<IndexType> {
+        self.table_index
+    }
+
+    /// Get the path indices of this column entry.
+    pub fn path_indices(&self) -> Option<&[IndexType]> {
+        self.path_indices.as_deref()
+    }
+
+    /// Check if this column entry contains path_indices
+    pub fn has_path_indices(&self) -> bool {
+        self.path_indices.is_some()
+    }
+}
+
+/// TODO(xuanwo): migrate this as a function of metadata.
+pub fn find_smallest_column(entries: &[ColumnEntry]) -> usize {
+    debug_assert!(!entries.is_empty());
+    let mut column_indexes = entries
+        .iter()
+        .map(|entry| entry.column_index)
+        .collect::<Vec<IndexType>>();
+    column_indexes.sort();
+    let mut smallest_index = column_indexes[0];
+    let mut smallest_size = usize::MAX;
+    for (idx, column_entry) in entries.iter().enumerate() {
+        if let Ok(bytes) = column_entry.data_type.data_type_id().numeric_byte_size() {
+            if smallest_size > bytes {
+                smallest_size = bytes;
+                smallest_index = entries[idx].column_index;
+            }
+        }
+    }
+    smallest_index
+}