Definition
/**
* SQL standard CURRENT_TIMESTAMP function.
*
* Returns the current date and time (at the start of the transaction).
* Useful as a column default value or in SELECT queries.
*
* Example: column('created_at', data_type_timestamp())->default(current_timestamp())
* Example: select()->select(current_timestamp()->as('now'))
*/
current_timestamp() : SQLValueFunctionExpression