/**
* call-seq:
* getColumnPrecision(col)
*
* Returns the precision of the specified column. Precision is the total
* number of digits in a number. eg: 123.45 has a precision of 5. For
* non-numeric types, it's the number of characters in the string. "col"
* may be specified as the column name or number. */
static VALUE sqlrcur_getColumnPrecision(VALUE self, VALUE col) {