public void validateCall(
SqlCall call,
SqlValidator validator,
SqlValidatorScope scope,
SqlValidatorScope operandScope) {
// The base method validates all operands. We override because
// we don't want to validate the identifier.
final SqlNode[] operands = call.operands;
assert operands.length == 2;
assert operands[1] instanceof SqlIdentifier;
operands[0].validateExpr(validator, scope);
SqlIdentifier id = (SqlIdentifier) operands[1];
if (!id.isSimple()) {
throw validator.newValidationError(
id, EigenbaseResource.instance().AliasMustBeSimpleIdentifier.ex());
}
}
public void validate(SqlValidator validator, SqlValidatorScope scope) {
validator.validateDynamicParam(this);
}
/**
* Validates this node in an expression context.
*
* <p>Usually, this method does much the same as {@link #validate}, but a {@link SqlIdentifier}
* can occur in expression and non-expression contexts.
*/
public void validateExpr(SqlValidator validator, SqlValidatorScope scope) {
validate(validator, scope);
Util.discard(validator.deriveType(scope, this));
}
public RelDataType deriveType(SqlValidator validator, SqlValidatorScope scope, SqlCall call) {
// special case for AS: never try to derive type for alias
RelDataType nodeType = validator.deriveType(scope, call.operands[0]);
assert nodeType != null;
return validateOperands(validator, scope, call);
}