mirror/sqlgen
1
0
Fork 0
mirror of https://github.com/getml/sqlgen.git synced 2026-02-21 00:08:40 -06:00
Code Issues Packages Projects Releases Wiki Activity

Prohibit nested aggregations (#21)

Browse Source
This commit is contained in:
Dr. Patrick Urbanke (劉自成)
2025-06-23 22:55:46 +02:00
committed by GitHub
parent 30ba548f1e
commit e4b821138a
1 changed files with 33 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
include/sqlgen/transpilation/make_field.hpp
View File

@@ -19,6 +19,7 @@
#include "all_columns_exist.hpp"
#include "dynamic_aggregation_t.hpp"
#include "dynamic_operator_t.hpp"
#include "remove_as_t.hpp"
#include "remove_nullable_t.hpp"
#include "to_value.hpp"
#include "underlying_t.hpp"
@@ -108,8 +109,39 @@ struct MakeField<StructType, Aggregation<_agg, ValueType>> {
remove_nullable_t<underlying_t<StructType, ValueType>>>,
"Values inside the aggregation must be numerical.");
// Recursively checks if a type contains any aggregations.
template <class T>
struct HasAggregations;
// Case: No operation.
template <class T>
requires(!MakeField<StructType, remove_as_t<T>>::is_operation)
struct HasAggregations<T> {
static constexpr bool value =
MakeField<StructType, remove_as_t<T>>::is_aggregation;
};
// Case: Is operations: Check all operands.
template <class T>
requires(MakeField<StructType, remove_as_t<T>>::is_operation)
struct HasAggregations<T> {
static constexpr bool value = HasAggregations<
typename MakeField<StructType, remove_as_t<T>>::Operands>::value;
};
// Case: Is a set of operands from an operation..
template <class... FieldTypes>
struct HasAggregations<rfl::Tuple<FieldTypes...>> {
static constexpr bool value =
(false || ... || HasAggregations<FieldTypes>::value);
};
static_assert(!HasAggregations<remove_as_t<ValueType>>::value,
"Nested aggregations are not allowed. Please restructure your "
"query to avoid nested aggregations.");
static constexpr bool is_aggregation = true;
static constexpr bool is_column = true;
static constexpr bool is_column = false;
static constexpr bool is_operation = false;
using Name = Nothing;