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62 lines
1.4 KiB
62 lines
1.4 KiB
'use strict';
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const DATE_OIDS = Object.freeze({
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1082: 'DATE',
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1083: 'TIME',
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1114: 'TIMESTAMP',
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1184: 'TIMESTAMPTZ',
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1266: 'TIMETZ'
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});
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/**
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* Wrap a query transforming all date columns into a unix epoch
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* @param {*} originalQuery
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* @param {*} fields
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*/
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function wrapDates (originalQuery, fields) {
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return `
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SELECT
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${fields.map(field => _isDateType(field) ? _castColumnToEpoch(field.name) : `"${field.name}"`).join(',')}
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FROM
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(${originalQuery}) _cdb_epoch_transformation `;
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}
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/**
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* @param {object} field
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*/
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function _isDateType (field) {
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return Object.prototype.hasOwnProperty.call(DATE_OIDS, field.dataTypeID);
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}
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/**
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* Return a sql query to transform a date column into a unix epoch
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* @param {string} column - The name of the date column
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*/
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function _castColumnToEpoch (columnName) {
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return `date_part('epoch', "${columnName}") as "${columnName}"`;
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}
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function getColumnsWithWrappedDates (query) {
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if (!query) {
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return;
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}
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if (!query.match(/\b_cdb_epoch_transformation\b/)) {
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return;
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}
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const columns = [];
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const fieldMatcher = /\bdate_part\('epoch', "([^"]+)"\) as "([^"]+)"/gmi;
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let match;
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do {
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match = fieldMatcher.exec(query);
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if (match && match[1] === match[2]) {
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columns.push(match[1]);
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}
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} while (match);
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return columns;
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}
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module.exports = {
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wrapDates,
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getColumnsWithWrappedDates
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};
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