arrow_flight/sql/metadata/sql_info.rs
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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.
//! Helpers for building responses to [`CommandGetSqlInfo`] metadata requests.
//!
//! - [`SqlInfoDataBuilder`] - a builder for collecting sql infos
//! and building a conformant `RecordBatch` with sql info server metadata.
//! - [`SqlInfoData`] - a helper type wrapping a `RecordBatch`
//! used for storing sql info server metadata.
//! - [`GetSqlInfoBuilder`] - a builder for consructing [`CommandGetSqlInfo`] responses.
//!
use std::collections::{BTreeMap, HashMap};
use std::sync::Arc;
use arrow_arith::boolean::or;
use arrow_array::array::{Array, UInt32Array, UnionArray};
use arrow_array::builder::{
ArrayBuilder, BooleanBuilder, Int32Builder, Int64Builder, Int8Builder, ListBuilder, MapBuilder,
StringBuilder, UInt32Builder,
};
use arrow_array::{RecordBatch, Scalar};
use arrow_data::ArrayData;
use arrow_ord::cmp::eq;
use arrow_schema::{DataType, Field, Fields, Schema, SchemaRef, UnionFields, UnionMode};
use arrow_select::filter::filter_record_batch;
use once_cell::sync::Lazy;
use crate::error::Result;
use crate::sql::{CommandGetSqlInfo, SqlInfo};
/// Represents a dynamic value
#[derive(Debug, Clone, PartialEq)]
pub enum SqlInfoValue {
String(String),
Bool(bool),
BigInt(i64),
Bitmask(i32),
StringList(Vec<String>),
ListMap(BTreeMap<i32, Vec<i32>>),
}
impl From<&str> for SqlInfoValue {
fn from(value: &str) -> Self {
Self::String(value.to_string())
}
}
impl From<bool> for SqlInfoValue {
fn from(value: bool) -> Self {
Self::Bool(value)
}
}
impl From<i32> for SqlInfoValue {
fn from(value: i32) -> Self {
Self::Bitmask(value)
}
}
impl From<i64> for SqlInfoValue {
fn from(value: i64) -> Self {
Self::BigInt(value)
}
}
impl From<&[&str]> for SqlInfoValue {
fn from(values: &[&str]) -> Self {
let values = values.iter().map(|s| s.to_string()).collect();
Self::StringList(values)
}
}
impl From<Vec<String>> for SqlInfoValue {
fn from(values: Vec<String>) -> Self {
Self::StringList(values)
}
}
impl From<BTreeMap<i32, Vec<i32>>> for SqlInfoValue {
fn from(value: BTreeMap<i32, Vec<i32>>) -> Self {
Self::ListMap(value)
}
}
impl From<HashMap<i32, Vec<i32>>> for SqlInfoValue {
fn from(value: HashMap<i32, Vec<i32>>) -> Self {
Self::ListMap(value.into_iter().collect())
}
}
impl From<&HashMap<i32, Vec<i32>>> for SqlInfoValue {
fn from(value: &HashMap<i32, Vec<i32>>) -> Self {
Self::ListMap(
value
.iter()
.map(|(k, v)| (k.to_owned(), v.to_owned()))
.collect(),
)
}
}
/// Something that can be converted into u32 (the represenation of a [`SqlInfo`] name)
pub trait SqlInfoName {
fn as_u32(&self) -> u32;
}
impl SqlInfoName for SqlInfo {
fn as_u32(&self) -> u32 {
// SqlInfos are u32 in the flight spec, but for some reason
// SqlInfo repr is an i32, so convert between them
u32::try_from(i32::from(*self)).expect("SqlInfo fit into u32")
}
}
// Allow passing u32 directly into to with_sql_info
impl SqlInfoName for u32 {
fn as_u32(&self) -> u32 {
*self
}
}
/// Handles creating the dense [`UnionArray`] described by [flightsql]
///
/// incrementally build types/offset of the dense union. See [Union Spec] for details.
///
/// ```text
/// * value: dense_union<
/// * string_value: utf8,
/// * bool_value: bool,
/// * bigint_value: int64,
/// * int32_bitmask: int32,
/// * string_list: list<string_data: utf8>
/// * int32_to_int32_list_map: map<key: int32, value: list<$data$: int32>>
/// * >
/// ```
///[flightsql]: https://github.com/apache/arrow/blob/f9324b79bf4fc1ec7e97b32e3cce16e75ef0f5e3/format/FlightSql.proto#L32-L43
///[Union Spec]: https://arrow.apache.org/docs/format/Columnar.html#dense-union
struct SqlInfoUnionBuilder {
// Values for each child type
string_values: StringBuilder,
bool_values: BooleanBuilder,
bigint_values: Int64Builder,
int32_bitmask_values: Int32Builder,
string_list_values: ListBuilder<StringBuilder>,
int32_to_int32_list_map_values: MapBuilder<Int32Builder, ListBuilder<Int32Builder>>,
type_ids: Int8Builder,
offsets: Int32Builder,
}
/// [`DataType`] for the output union array
static UNION_TYPE: Lazy<DataType> = Lazy::new(|| {
let fields = vec![
Field::new("string_value", DataType::Utf8, false),
Field::new("bool_value", DataType::Boolean, false),
Field::new("bigint_value", DataType::Int64, false),
Field::new("int32_bitmask", DataType::Int32, false),
// treat list as nullable b/c that is what the builders make
Field::new(
"string_list",
DataType::List(Arc::new(Field::new("item", DataType::Utf8, true))),
true,
),
Field::new(
"int32_to_int32_list_map",
DataType::Map(
Arc::new(Field::new(
"entries",
DataType::Struct(Fields::from(vec![
Field::new("keys", DataType::Int32, false),
Field::new(
"values",
DataType::List(Arc::new(Field::new("item", DataType::Int32, true))),
true,
),
])),
false,
)),
false,
),
true,
),
];
// create "type ids", one for each type, assume they go from 0 .. num_fields
let type_ids: Vec<i8> = (0..fields.len()).map(|v| v as i8).collect();
DataType::Union(UnionFields::new(type_ids, fields), UnionMode::Dense)
});
impl SqlInfoUnionBuilder {
pub fn new() -> Self {
Self {
string_values: StringBuilder::new(),
bool_values: BooleanBuilder::new(),
bigint_values: Int64Builder::new(),
int32_bitmask_values: Int32Builder::new(),
string_list_values: ListBuilder::new(StringBuilder::new()),
int32_to_int32_list_map_values: MapBuilder::new(
None,
Int32Builder::new(),
ListBuilder::new(Int32Builder::new()),
),
type_ids: Int8Builder::new(),
offsets: Int32Builder::new(),
}
}
/// Returns the DataType created by this builder
pub fn schema() -> &'static DataType {
&UNION_TYPE
}
/// Append the specified value to this builder
pub fn append_value(&mut self, v: &SqlInfoValue) -> Result<()> {
// typeid is which child and len is the child array's length
// *after* adding the value
let (type_id, len) = match v {
SqlInfoValue::String(v) => {
self.string_values.append_value(v);
(0, self.string_values.len())
}
SqlInfoValue::Bool(v) => {
self.bool_values.append_value(*v);
(1, self.bool_values.len())
}
SqlInfoValue::BigInt(v) => {
self.bigint_values.append_value(*v);
(2, self.bigint_values.len())
}
SqlInfoValue::Bitmask(v) => {
self.int32_bitmask_values.append_value(*v);
(3, self.int32_bitmask_values.len())
}
SqlInfoValue::StringList(values) => {
// build list
for v in values {
self.string_list_values.values().append_value(v);
}
// complete the list
self.string_list_values.append(true);
(4, self.string_list_values.len())
}
SqlInfoValue::ListMap(values) => {
// build map
for (k, v) in values.clone() {
self.int32_to_int32_list_map_values.keys().append_value(k);
self.int32_to_int32_list_map_values
.values()
.append_value(v.into_iter().map(Some));
}
// complete the list
self.int32_to_int32_list_map_values.append(true)?;
(5, self.int32_to_int32_list_map_values.len())
}
};
self.type_ids.append_value(type_id);
let len = i32::try_from(len).expect("offset fit in i32");
self.offsets.append_value(len - 1);
Ok(())
}
/// Complete the construction and build the [`UnionArray`]
pub fn finish(self) -> UnionArray {
let Self {
mut string_values,
mut bool_values,
mut bigint_values,
mut int32_bitmask_values,
mut string_list_values,
mut int32_to_int32_list_map_values,
mut type_ids,
mut offsets,
} = self;
let type_ids = type_ids.finish();
let offsets = offsets.finish();
// form the correct ArrayData
let len = offsets.len();
let null_bit_buffer = None;
let offset = 0;
let buffers = vec![
type_ids.into_data().buffers()[0].clone(),
offsets.into_data().buffers()[0].clone(),
];
let child_data = vec![
string_values.finish().into_data(),
bool_values.finish().into_data(),
bigint_values.finish().into_data(),
int32_bitmask_values.finish().into_data(),
string_list_values.finish().into_data(),
int32_to_int32_list_map_values.finish().into_data(),
];
let data = ArrayData::try_new(
UNION_TYPE.clone(),
len,
null_bit_buffer,
offset,
buffers,
child_data,
)
.expect("Correctly created UnionArray");
UnionArray::from(data)
}
}
/// Helper to create [`CommandGetSqlInfo`] responses.
///
/// [`CommandGetSqlInfo`] are metadata requests used by a Flight SQL
/// server to communicate supported capabilities to Flight SQL clients.
///
/// Servers constuct - usually static - [`SqlInfoData`] via the [`SqlInfoDataBuilder`],
/// and build responses using [`CommandGetSqlInfo::into_builder`]
#[derive(Debug, Clone, PartialEq, Default)]
pub struct SqlInfoDataBuilder {
/// Use BTreeMap to ensure the values are sorted by value as
/// to make output consistent
///
/// Use u32 to support "custom" sql info values that are not
/// part of the SqlInfo enum
infos: BTreeMap<u32, SqlInfoValue>,
}
impl SqlInfoDataBuilder {
/// Create a new SQL info builder
pub fn new() -> Self {
Self::default()
}
/// register the specific sql metadata item
pub fn append(&mut self, name: impl SqlInfoName, value: impl Into<SqlInfoValue>) {
self.infos.insert(name.as_u32(), value.into());
}
/// Encode the contents of this list according to the [FlightSQL spec]
///
/// [FlightSQL spec]: https://github.com/apache/arrow/blob/f9324b79bf4fc1ec7e97b32e3cce16e75ef0f5e3/format/FlightSql.proto#L32-L43
pub fn build(self) -> Result<SqlInfoData> {
let mut name_builder = UInt32Builder::new();
let mut value_builder = SqlInfoUnionBuilder::new();
let mut names: Vec<_> = self.infos.keys().cloned().collect();
names.sort_unstable();
for key in names {
let (name, value) = self.infos.get_key_value(&key).unwrap();
name_builder.append_value(*name);
value_builder.append_value(value)?
}
let batch = RecordBatch::try_from_iter(vec![
("info_name", Arc::new(name_builder.finish()) as _),
("value", Arc::new(value_builder.finish()) as _),
])?;
Ok(SqlInfoData { batch })
}
/// Return the [`Schema`] for a GetSchema RPC call with [`crate::sql::CommandGetSqlInfo`]
pub fn schema() -> &'static Schema {
// It is always the same
&SQL_INFO_SCHEMA
}
}
/// A builder for [`SqlInfoData`] which is used to create [`CommandGetSqlInfo`] responses.
///
/// # Example
/// ```
/// # use arrow_flight::sql::{metadata::SqlInfoDataBuilder, SqlInfo, SqlSupportedTransaction};
/// // Create the list of metadata describing the server
/// let mut builder = SqlInfoDataBuilder::new();
/// builder.append(SqlInfo::FlightSqlServerName, "server name");
/// // ... add other SqlInfo here ..
/// builder.append(
/// SqlInfo::FlightSqlServerTransaction,
/// SqlSupportedTransaction::Transaction as i32,
/// );
///
/// // Create the batch to send back to the client
/// let info_data = builder.build().unwrap();
/// ```
///
/// [protos]: https://github.com/apache/arrow/blob/6d3d2fca2c9693231fa1e52c142ceef563fc23f9/format/FlightSql.proto#L71-L820
pub struct SqlInfoData {
batch: RecordBatch,
}
impl SqlInfoData {
/// Return a [`RecordBatch`] containing only the requested `u32`, if any
/// from [`CommandGetSqlInfo`]
pub fn record_batch(&self, info: impl IntoIterator<Item = u32>) -> Result<RecordBatch> {
let arr = self.batch.column(0);
let type_filter = info
.into_iter()
.map(|tt| {
let s = UInt32Array::from(vec![tt]);
eq(arr, &Scalar::new(&s))
})
.collect::<std::result::Result<Vec<_>, _>>()?
.into_iter()
// We know the arrays are of same length as they are produced from the same root array
.reduce(|filter, arr| or(&filter, &arr).unwrap());
if let Some(filter) = type_filter {
Ok(filter_record_batch(&self.batch, &filter)?)
} else {
Ok(self.batch.clone())
}
}
/// Return the schema of the RecordBatch that will be returned
/// from [`CommandGetSqlInfo`]
pub fn schema(&self) -> SchemaRef {
self.batch.schema()
}
}
/// A builder for a [`CommandGetSqlInfo`] response.
pub struct GetSqlInfoBuilder<'a> {
/// requested `SqlInfo`s. If empty means return all infos.
info: Vec<u32>,
infos: &'a SqlInfoData,
}
impl CommandGetSqlInfo {
/// Create a builder suitable for constructing a response
pub fn into_builder(self, infos: &SqlInfoData) -> GetSqlInfoBuilder {
GetSqlInfoBuilder {
info: self.info,
infos,
}
}
}
impl GetSqlInfoBuilder<'_> {
/// Builds a `RecordBatch` with the correct schema for a [`CommandGetSqlInfo`] response
pub fn build(self) -> Result<RecordBatch> {
self.infos.record_batch(self.info)
}
/// Return the schema of the RecordBatch that will be returned
/// from [`CommandGetSqlInfo`]
pub fn schema(&self) -> SchemaRef {
self.infos.schema()
}
}
// The schema produced by [`SqlInfoData`]
static SQL_INFO_SCHEMA: Lazy<Schema> = Lazy::new(|| {
Schema::new(vec![
Field::new("info_name", DataType::UInt32, false),
Field::new("value", SqlInfoUnionBuilder::schema().clone(), false),
])
});
#[cfg(test)]
mod tests {
use std::collections::HashMap;
use super::SqlInfoDataBuilder;
use crate::sql::metadata::tests::assert_batches_eq;
use crate::sql::{SqlInfo, SqlNullOrdering, SqlSupportedTransaction, SqlSupportsConvert};
#[test]
fn test_sql_infos() {
let mut convert: HashMap<i32, Vec<i32>> = HashMap::new();
convert.insert(
SqlSupportsConvert::SqlConvertInteger as i32,
vec![
SqlSupportsConvert::SqlConvertFloat as i32,
SqlSupportsConvert::SqlConvertReal as i32,
],
);
let mut builder = SqlInfoDataBuilder::new();
// str
builder.append(SqlInfo::SqlIdentifierQuoteChar, r#"""#);
// bool
builder.append(SqlInfo::SqlDdlCatalog, false);
// i32
builder.append(
SqlInfo::SqlNullOrdering,
SqlNullOrdering::SqlNullsSortedHigh as i32,
);
// i64
builder.append(SqlInfo::SqlMaxBinaryLiteralLength, i32::MAX as i64);
// [str]
builder.append(SqlInfo::SqlKeywords, &["SELECT", "DELETE"] as &[&str]);
builder.append(SqlInfo::SqlSupportsConvert, &convert);
let batch = builder.build().unwrap().record_batch(None).unwrap();
let expected = vec![
"+-----------+----------------------------------------+",
"| info_name | value |",
"+-----------+----------------------------------------+",
"| 500 | {bool_value=false} |",
"| 504 | {string_value=\"} |",
"| 507 | {int32_bitmask=0} |",
"| 508 | {string_list=[SELECT, DELETE]} |",
"| 517 | {int32_to_int32_list_map={7: [6, 13]}} |",
"| 541 | {bigint_value=2147483647} |",
"+-----------+----------------------------------------+",
];
assert_batches_eq(&[batch], &expected);
}
#[test]
fn test_filter_sql_infos() {
let mut builder = SqlInfoDataBuilder::new();
builder.append(SqlInfo::FlightSqlServerName, "server name");
builder.append(
SqlInfo::FlightSqlServerTransaction,
SqlSupportedTransaction::Transaction as i32,
);
let data = builder.build().unwrap();
let batch = data.record_batch(None).unwrap();
assert_eq!(batch.num_rows(), 2);
let batch = data
.record_batch([SqlInfo::FlightSqlServerTransaction as u32])
.unwrap();
let mut ref_builder = SqlInfoDataBuilder::new();
ref_builder.append(
SqlInfo::FlightSqlServerTransaction,
SqlSupportedTransaction::Transaction as i32,
);
let ref_batch = ref_builder.build().unwrap().record_batch(None).unwrap();
assert_eq!(batch, ref_batch);
}
}