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export shred.materializePath #49

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export shred.materializePath #49

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62 changes: 32 additions & 30 deletions lib/shred.js
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Original file line number Diff line number Diff line change
Expand Up @@ -155,44 +155,46 @@ function shredRecordInternal(fields, record, data, rlvl, dlvl) {
*
*/
exports.materializeRecords = function(schema, buffer) {
let records = [];
for (let i = 0; i < buffer.rowCount; ++i) {
records.push({});
}
let records;

for (let k in buffer.columnData) {
const field = schema.findField(k);
const fieldBranch = schema.findFieldBranch(k);
let values = buffer.columnData[k].values[Symbol.iterator]();

let rLevels = new Array(field.rLevelMax + 1);
rLevels.fill(0);

for (let i = 0; i < buffer.columnData[k].count; ++i) {
const dLevel = buffer.columnData[k].dlevels[i];
const rLevel = buffer.columnData[k].rlevels[i];

rLevels[rLevel]++;
rLevels.fill(0, rLevel + 1);

let value = null;
if (dLevel === field.dLevelMax) {
value = parquet_types.fromPrimitive(
field.originalType || field.primitiveType,
values.next().value);
}
records = exports.materializePath(field, fieldBranch, buffer.columnData[k], buffer.rowCount, records);
}

materializeRecordField(
records[rLevels[0] - 1],
fieldBranch,
rLevels.slice(1),
dLevel,
value);
return records;
};

exports.materializePath = function(field, fieldBranch, data, rowCount, records) {
records = records || [...Array(rowCount)].map( () => ({}));
let values = data.values[Symbol.iterator]();
let rLevels = new Array(field.rLevelMax + 1);
rLevels.fill(0);

for (let i = 0; i < data.count; ++i) {
const dLevel = data.dlevels[i];
const rLevel = data.rlevels[i];

rLevels[rLevel]++;
rLevels.fill(0, rLevel + 1);

let value = null;
if (dLevel === field.dLevelMax) {
value = parquet_types.fromPrimitive(
field.originalType || field.primitiveType,
values.next().value);
}
}

materializeRecordField(
records[rLevels[0] - 1],
fieldBranch,
rLevels.slice(1),
dLevel,
value);
}
return records;
}
};

function materializeRecordField(record, branch, rLevels, dLevel, value) {
const node = branch[0];
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