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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| // Copyright 2023 Greptime Team | ||
| // | ||
| // 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::f64::consts::E; | ||
| use std::sync::Arc; | ||
|
|
||
| use common_query::AddColumnLocation; | ||
| use faker_rand::lorem::Word; | ||
| use rand::{random, Rng}; | ||
| use snafu::ensure; | ||
|
|
||
| use crate::error::{self, Result}; | ||
| use crate::ir::alter_expr::{AlterTableExpr, AlterTableOperation}; | ||
| use crate::ir::{droppable_columns, Column}; | ||
|
|
||
| pub struct AlterTableExprGenerator { | ||
| name: String, | ||
| columns: Arc<Vec<Column>>, | ||
| ignore_no_droppable_column: bool, | ||
| } | ||
|
|
||
| impl AlterTableExprGenerator { | ||
| pub fn new(name: String, columns: Arc<Vec<Column>>) -> Self { | ||
| Self { | ||
| name, | ||
| columns, | ||
| ignore_no_droppable_column: false, | ||
| } | ||
| } | ||
|
|
||
| /// If the `ignore_no_droppable_column` is true, it retries if there is no droppable column. | ||
| pub fn ignore_no_droppable_column(mut self, v: bool) -> Self { | ||
| self.ignore_no_droppable_column = v; | ||
| self | ||
| } | ||
|
|
||
| fn generate_inner(&self) -> Result<AlterTableExpr> { | ||
| let mut rng = rand::thread_rng(); | ||
| let idx = rng.gen_range(0..3); | ||
| // 0 -> AddColumn | ||
| // 1 -> DropColumn(invariant: We can't non-primary key columns, non-ts columns) | ||
| // 2 -> RenameTable | ||
| let alter_expr = match idx { | ||
| 0 => { | ||
| let with_location = rng.gen::<bool>(); | ||
| let location = if with_location { | ||
| let use_first = rng.gen::<bool>(); | ||
| let location = if use_first { | ||
| AddColumnLocation::First | ||
| } else { | ||
| AddColumnLocation::After { | ||
| column_name: self.columns[rng.gen_range(0..self.columns.len())] | ||
| .name | ||
| .to_string(), | ||
| } | ||
| }; | ||
| Some(location) | ||
| } else { | ||
| None | ||
| }; | ||
| let column = rng.gen::<Column>(); | ||
| AlterTableExpr { | ||
| name: self.name.to_string(), | ||
| alter_options: AlterTableOperation::AddColumn { column, location }, | ||
| } | ||
| } | ||
| 1 => { | ||
| let droppable = droppable_columns(&self.columns); | ||
| ensure!(!droppable.is_empty(), error::DroppableColumnsSnafu); | ||
| let name = droppable[rng.gen_range(0..droppable.len())] | ||
| .name | ||
| .to_string(); | ||
| AlterTableExpr { | ||
| name: self.name.to_string(), | ||
| alter_options: AlterTableOperation::DropColumn { name }, | ||
| } | ||
| } | ||
| 2 => { | ||
| let mut new_table_name = rng.gen::<Word>().to_string(); | ||
| if new_table_name == self.name { | ||
| new_table_name = format!("{}-{}", self.name, rng.gen::<u64>()); | ||
| } | ||
| AlterTableExpr { | ||
| name: self.name.to_string(), | ||
| alter_options: AlterTableOperation::RenameTable { new_table_name }, | ||
| } | ||
| } | ||
| _ => unreachable!(), | ||
| }; | ||
|
|
||
| Ok(alter_expr) | ||
| } | ||
|
|
||
| /// Generates the [AlterTableExpr]. | ||
| pub fn generate(&self) -> Result<AlterTableExpr> { | ||
| match self.generate_inner() { | ||
| Ok(expr) => Ok(expr), | ||
| Err(err) => { | ||
| if matches!(err, error::Error::DroppableColumns { .. }) { | ||
| return self.generate(); | ||
| } | ||
| Err(err) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use std::sync::Arc; | ||
|
|
||
| use super::AlterTableExprGenerator; | ||
| use crate::generator::create_expr::CreateTableExprGenerator; | ||
| use crate::generator::Generator; | ||
|
|
||
| #[test] | ||
| fn test_alter_table_expr_generator() { | ||
| let create_expr = CreateTableExprGenerator::default() | ||
| .columns(10) | ||
| .generate() | ||
| .unwrap(); | ||
|
|
||
| let alter_expr = AlterTableExprGenerator::new( | ||
| create_expr.name.to_string(), | ||
| Arc::new(create_expr.columns), | ||
| ) | ||
| .ignore_no_droppable_column(true) | ||
| .generate() | ||
| .unwrap(); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| // Copyright 2023 Greptime Team | ||
| // | ||
| // 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 common_query::AddColumnLocation; | ||
| use derive_builder::Builder; | ||
|
|
||
| use crate::ir::Column; | ||
|
|
||
| #[derive(Debug, Builder, Clone)] | ||
| pub struct AlterTableExpr { | ||
| pub name: String, | ||
| pub alter_options: AlterTableOperation, | ||
| } | ||
|
|
||
| #[derive(Debug, Clone)] | ||
| pub enum AlterTableOperation { | ||
| /// `ADD [ COLUMN ] <column_def> [location]` | ||
| AddColumn { | ||
| column: Column, | ||
| location: Option<AddColumnLocation>, | ||
| }, | ||
| /// `DROP COLUMN <name>` | ||
| DropColumn { name: String }, | ||
| /// `RENAME <new_table_name>` | ||
| RenameTable { new_table_name: String }, | ||
| } |
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