1#include "duckdb/function/table/range.hpp"
2#include "duckdb/common/algorithm.hpp"
3
4namespace duckdb {
5
6struct RepeatRowFunctionData : public TableFunctionData {
7 RepeatRowFunctionData(vector<Value> values, idx_t target_count)
8 : values(std::move(values)), target_count(target_count) {
9 }
10
11 const vector<Value> values;
12 idx_t target_count;
13};
14
15struct RepeatRowOperatorData : public GlobalTableFunctionState {
16 RepeatRowOperatorData() : current_count(0) {
17 }
18 idx_t current_count;
19};
20
21static unique_ptr<FunctionData> RepeatRowBind(ClientContext &context, TableFunctionBindInput &input,
22 vector<LogicalType> &return_types, vector<string> &names) {
23 auto &inputs = input.inputs;
24 for (idx_t input_idx = 0; input_idx < inputs.size(); input_idx++) {
25 return_types.push_back(x: inputs[input_idx].type());
26 names.push_back(x: "column" + std::to_string(val: input_idx));
27 }
28 auto entry = input.named_parameters.find(x: "num_rows");
29 if (entry == input.named_parameters.end()) {
30 throw BinderException("repeat_rows requires num_rows to be specified");
31 }
32 if (inputs.empty()) {
33 throw BinderException("repeat_rows requires at least one column to be specified");
34 }
35 return make_uniq<RepeatRowFunctionData>(args&: inputs, args: entry->second.GetValue<int64_t>());
36}
37
38static unique_ptr<GlobalTableFunctionState> RepeatRowInit(ClientContext &context, TableFunctionInitInput &input) {
39 return make_uniq<RepeatRowOperatorData>();
40}
41
42static void RepeatRowFunction(ClientContext &context, TableFunctionInput &data_p, DataChunk &output) {
43 auto &bind_data = data_p.bind_data->Cast<RepeatRowFunctionData>();
44 auto &state = data_p.global_state->Cast<RepeatRowOperatorData>();
45
46 idx_t remaining = MinValue<idx_t>(a: bind_data.target_count - state.current_count, STANDARD_VECTOR_SIZE);
47 for (idx_t val_idx = 0; val_idx < bind_data.values.size(); val_idx++) {
48 output.data[val_idx].Reference(value: bind_data.values[val_idx]);
49 }
50 output.SetCardinality(remaining);
51 state.current_count += remaining;
52}
53
54static unique_ptr<NodeStatistics> RepeatRowCardinality(ClientContext &context, const FunctionData *bind_data_p) {
55 auto &bind_data = bind_data_p->Cast<RepeatRowFunctionData>();
56 return make_uniq<NodeStatistics>(args: bind_data.target_count, args: bind_data.target_count);
57}
58
59void RepeatRowTableFunction::RegisterFunction(BuiltinFunctions &set) {
60 TableFunction repeat_row("repeat_row", {}, RepeatRowFunction, RepeatRowBind, RepeatRowInit);
61 repeat_row.varargs = LogicalType::ANY;
62 repeat_row.named_parameters["num_rows"] = LogicalType::BIGINT;
63 repeat_row.cardinality = RepeatRowCardinality;
64 set.AddFunction(function: repeat_row);
65}
66
67} // namespace duckdb
68