vendor/illuminate/database/Query/Grammars/SQLiteGrammar.php

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<?php

namespace Illuminate\Database\Query\Grammars;

use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use Illuminate\Database\Query\Builder;

class SQLiteGrammar extends Grammar
{
    /**
     * The components that make up a select clause.
     *
     * @var array
     */
    protected $selectComponents = [
        'aggregate',
        'columns',
        'from',
        'joins',
        'wheres',
        'groups',
        'havings',
        'orders',
        'limit',
        'offset',
        'lock',
    ];

    /**
     * All of the available clause operators.
     *
     * @var array
     */
    protected $operators = [
        '=', '<', '>', '<=', '>=', '<>', '!=',
        'like', 'not like', 'ilike',
        '&', '|', '<<', '>>',
    ];

    /**
     * Compile a select query into SQL.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @return string
     */
    public function compileSelect(Builder $query)
    {
        if ($query->unions && $query->aggregate) {
            return $this->compileUnionAggregate($query);
        }

        $sql = parent::compileSelect($query);

        if ($query->unions) {
            $sql = 'select * from ('.$sql.') '.$this->compileUnions($query);
        }

        return $sql;
    }