protected RelDataType validateImpl() {
final RelDataTypeFactory.FieldInfoBuilder builder = validator.getTypeFactory().builder();
for (SqlMoniker moniker : validator.catalogReader.getAllSchemaObjectNames(names)) {
final List<String> names1 = moniker.getFullyQualifiedNames();
final SqlValidatorTable table = validator.catalogReader.getTable(names1);
builder.add(Util.last(names1), table.getRowType());
}
return builder.build();
}
/**
* Derives an alias for a node, and invents a mangled identifier if it cannot.
*
* <p>Examples:
*
* <ul>
* <li>Alias: "1 + 2 as foo" yields "foo"
* <li>Identifier: "foo.bar.baz" yields "baz"
* <li>Anything else yields "expr$<i>ordinal</i>"
* </ul>
*
* @return An alias, if one can be derived; or a synthetic alias "expr$<i>ordinal</i>" if ordinal
* < 0; otherwise null
*/
public static String getAlias(SqlNode node, int ordinal) {
switch (node.getKind()) {
case AS:
// E.g. "1 + 2 as foo" --> "foo"
return ((SqlCall) node).operand(1).toString();
case OVER:
// E.g. "bids over w" --> "bids"
return getAlias(((SqlCall) node).operand(0), ordinal);
case IDENTIFIER:
// E.g. "foo.bar" --> "bar"
return Util.last(((SqlIdentifier) node).names);
default:
if (ordinal < 0) {
return null;
} else {
return SqlUtil.deriveAliasFromOrdinal(ordinal);
}
}
}