csv-sql/src/select.js at master · DavidTimms/csv-sql · GitHub

22 lines (18 loc) · 619 Bytes

import {evaluateExpression} from './evaluate-expression';

export function performSelect(query) {

return inRow => {

const outputColumns = query.select;

if (outputColumns === '*') {

if (inRow.hasOwnProperty('_aggregateValues')) {

delete inRow._aggregateValues;

}

return inRow;

}

const outRow = {};

for (var i = 0; i < outputColumns.length; i++) {

const value = evaluateExpression(outputColumns[i].expression, inRow);

outRow[outputColumns[i].name] = value;

}

return outRow;

}

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