isCastable(String argName, SQLObject input) Determines if input referenced by the given argument name can received a link from
the given SQLObject without breaking type casting rules.
Parameters: argName - name of the operator input to which the source operator is beingconnected. Parameters: input - SQLObject to which input argument is being connected.
Determines if input referenced by the given argument name can received a link from
the given SQLObject without breaking type casting rules.
Parameters: argName - name of the operator input to which the source operator is beingconnected. Parameters: input - SQLObject to which input argument is being connected. true if 'argName' can be connected to input, false otherwise