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repeat_row.cpp
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67 lines (56 loc) · 2.59 KB
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#include "duckdb/function/table/range.hpp"
#include "duckdb/common/algorithm.hpp"
namespace duckdb {
struct RepeatRowFunctionData : public TableFunctionData {
RepeatRowFunctionData(vector<Value> values, idx_t target_count)
: values(std::move(values)), target_count(target_count) {
}
const vector<Value> values;
idx_t target_count;
};
struct RepeatRowOperatorData : public GlobalTableFunctionState {
RepeatRowOperatorData() : current_count(0) {
}
idx_t current_count;
};
static unique_ptr<FunctionData> RepeatRowBind(ClientContext &context, TableFunctionBindInput &input,
vector<LogicalType> &return_types, vector<string> &names) {
auto &inputs = input.inputs;
for (idx_t input_idx = 0; input_idx < inputs.size(); input_idx++) {
return_types.push_back(inputs[input_idx].type());
names.push_back("column" + std::to_string(input_idx));
}
auto entry = input.named_parameters.find("num_rows");
if (entry == input.named_parameters.end()) {
throw BinderException("repeat_rows requires num_rows to be specified");
}
if (inputs.empty()) {
throw BinderException("repeat_rows requires at least one column to be specified");
}
return make_uniq<RepeatRowFunctionData>(inputs, NumericCast<idx_t>(entry->second.GetValue<int64_t>()));
}
static unique_ptr<GlobalTableFunctionState> RepeatRowInit(ClientContext &context, TableFunctionInitInput &input) {
return make_uniq<RepeatRowOperatorData>();
}
static void RepeatRowFunction(ClientContext &context, TableFunctionInput &data_p, DataChunk &output) {
auto &bind_data = data_p.bind_data->Cast<RepeatRowFunctionData>();
auto &state = data_p.global_state->Cast<RepeatRowOperatorData>();
idx_t remaining = MinValue<idx_t>(bind_data.target_count - state.current_count, STANDARD_VECTOR_SIZE);
for (idx_t val_idx = 0; val_idx < bind_data.values.size(); val_idx++) {
output.data[val_idx].Reference(bind_data.values[val_idx]);
}
output.SetCardinality(remaining);
state.current_count += remaining;
}
static unique_ptr<NodeStatistics> RepeatRowCardinality(ClientContext &context, const FunctionData *bind_data_p) {
auto &bind_data = bind_data_p->Cast<RepeatRowFunctionData>();
return make_uniq<NodeStatistics>(bind_data.target_count, bind_data.target_count);
}
void RepeatRowTableFunction::RegisterFunction(BuiltinFunctions &set) {
TableFunction repeat_row("repeat_row", {}, RepeatRowFunction, RepeatRowBind, RepeatRowInit);
repeat_row.varargs = LogicalType::ANY;
repeat_row.named_parameters["num_rows"] = LogicalType::BIGINT;
repeat_row.cardinality = RepeatRowCardinality;
set.AddFunction(repeat_row);
}
} // namespace duckdb