src/Operation/Column/Add.php
public function execute(CapsuleInterface $capsule)
    {
        $schema = $capsule->getSchema($this->getTable());

        if ($schema->hasColumn($this->name)) {
            throw new ColumnException(
                "Unable to create column '{$schema->getName()}'.'{$this->name}', column already exists"
            );
        }

        //Declaring column
        $this->declareColumn($schema);
    }
public function execute(CapsuleInterface $capsule)
    {
        $schema = $capsule->getSchema($this->getTable());

        if ($schema->hasColumn($this->name)) {
            throw new ColumnException(
                "Unable to create column '{$schema->getName()}'.'{$this->name}', column already exists"
            );
        }

        //Declaring column
        $this->declareColumn($schema);
    }
{@inheritdoc}