/** @return true if all tuples match rowType; otherwise, assert on mismatch */
private boolean assertRowType() {
for (List<RexLiteral> tuple : tuples) {
assert tuple.size() == rowType.getFieldCount();
for (Pair<RexLiteral, RelDataTypeField> pair : Pair.zip(tuple, rowType.getFieldList())) {
RexLiteral literal = pair.left;
RelDataType fieldType = pair.right.getType();
// TODO jvs 19-Feb-2006: strengthen this a bit. For example,
// overflow, rounding, and padding/truncation must already have
// been dealt with.
if (!RexLiteral.isNullLiteral(literal)) {
assert (SqlTypeUtil.canAssignFrom(fieldType, literal.getType()));
}
}
}
return true;
}
/**
* Returns whether a node represents the NULL value or a series of nested CAST(NULL as <TYPE>)
* calls<br>
* For Example:<br>
* isNull(CAST(CAST(NULL as INTEGER) AS VARCHAR(1))) returns true
*/
public static boolean isNull(RexNode node) {
/* Checks to see if the RexNode is null */
return RexLiteral.isNullLiteral(node)
|| ((node.getKind() == RexKind.Cast) && isNull(((RexCall) node).operands[0]));
}