Paul Holden
eb2e261df4
When using the "Count distinct" aggregation type on a column that selects multiple fields, we should account for each of them in the returned SQL. Move helper method to facilitate this to the base aggregation class so it can be re-used between all types.
95 lines
2.7 KiB
PHP
95 lines
2.7 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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declare(strict_types=1);
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namespace core_reportbuilder\local\aggregation;
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use lang_string;
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use core_reportbuilder\local\report\column;
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/**
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* Column count distinct aggregation type
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*
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* @package core_reportbuilder
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* @copyright 2021 Paul Holden <paulh@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class countdistinct extends base {
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/**
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* Return aggregation name
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*
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* @return lang_string
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*/
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public static function get_name(): lang_string {
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return new lang_string('aggregationcountdistinct', 'core_reportbuilder');
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}
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/**
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* This aggregation can be performed on all column types
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*
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* @param int $columntype
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* @return bool
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*/
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public static function compatible(int $columntype): bool {
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return true;
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}
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/**
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* Override base method to ensure all SQL fields are concatenated together if there are multiple
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*
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* @param array $sqlfields
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* @return string
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*/
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public static function get_column_field_sql(array $sqlfields): string {
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if (count($sqlfields) === 1) {
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return parent::get_column_field_sql($sqlfields);
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}
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return self::get_column_fields_concat($sqlfields);
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}
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/**
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* Return the aggregated field SQL
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*
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* @param string $field
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* @param int $columntype
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* @return string
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*/
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public static function get_field_sql(string $field, int $columntype): string {
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global $DB;
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if ($columntype === column::TYPE_LONGTEXT && $DB->get_dbfamily() === 'oracle') {
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$field = $DB->sql_compare_text($field, 255);
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}
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return "COUNT(DISTINCT {$field})";
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}
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/**
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* Return formatted value for column when applying aggregation
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*
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* @param mixed $value
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* @param array $values
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* @param array $callbacks
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* @return mixed
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*/
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public static function format_value($value, array $values, array $callbacks) {
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return (int) reset($values);
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}
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}
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