src/Neutrino/Database/Schema/Dialect/WrapperTrait.php
public function addIndex($tableName, $schemaName, Db\IndexInterface $index)
    {
        return $this->dialect->addIndex($tableName, $schemaName, $index);
    }
public function addIndex($tableName, $schemaName, Db\IndexInterface $index)
    {
        return $this->dialect->addIndex($tableName, $schemaName, $index);
    }
Generates SQL to add an index to a table

@param string                     $tableName
@param string                     $schemaName
@param \Phalcon\Db\IndexInterface $index

@return string