| 446 | } |
| 447 | |
| 448 | void extractKeyValueFromMap( |
| 449 | const IColumn & nested_column, |
| 450 | const IColumn & key, |
| 451 | IColumn & result, |
| 452 | size_t start, |
| 453 | size_t end) |
| 454 | { |
| 455 | const auto & array_column = assert_cast<const ColumnArray &>(nested_column); |
| 456 | const auto & tuple_column = assert_cast<const ColumnTuple &>(array_column.getData()); |
| 457 | const auto & offsets = array_column.getOffsets(); |
| 458 | const auto & keys_column = tuple_column.getColumn(0); |
| 459 | const auto & values_column = tuple_column.getColumn(1); |
| 460 | |
| 461 | /// Phase 1: find the position of the requested key in each row. |
| 462 | PaddedPODArray<size_t> matched_positions; |
| 463 | findKeyPositionsDispatch(keys_column, offsets, key, start, end, matched_positions); |
| 464 | |
| 465 | /// Phase 2: extract values at the matched positions. |
| 466 | extractValuesDispatch(values_column, result, matched_positions); |
| 467 | } |
| 468 | |
| 469 | std::optional<std::pair<String, String>> tryParseMapSubcolumnName(const String & column_name) |
| 470 | { |
no test coverage detected