/**
* Internal method to create a call to a literal. Code outside this package should call one of the
* type-specific methods such as {@link #makeDateLiteral(Calendar)}, {@link
* #makeLiteral(boolean)}, {@link #makeLiteral(String)}.
*
* @param o Value of literal, must be appropriate for the type
* @param type Type of literal
* @param typeName SQL type of literal
* @return Literal
*/
protected RexLiteral makeLiteral(Comparable o, RelDataType type, SqlTypeName typeName) {
// All literals except NULL have NOT NULL types.
type = typeFactory.createTypeWithNullability(type, o == null);
if (typeName == SqlTypeName.CHAR) {
// Character literals must have a charset and collation. Populate
// from the type if necessary.
assert o instanceof NlsString;
NlsString nlsString = (NlsString) o;
if ((nlsString.getCollation() == null) || (nlsString.getCharset() == null)) {
assert type.getSqlTypeName() == SqlTypeName.CHAR;
assert type.getCharset().name() != null;
assert type.getCollation() != null;
o = new NlsString(nlsString.getValue(), type.getCharset().name(), type.getCollation());
}
}
return new RexLiteral(o, type, typeName);
}
public RelDataType createSqlType(RelDataTypeFactory typeFactory) {
BitString bitString;
switch (typeName) {
case NULL:
case BOOLEAN:
RelDataType ret = typeFactory.createSqlType(typeName);
ret = typeFactory.createTypeWithNullability(ret, null == value);
return ret;
case BINARY:
bitString = (BitString) value;
int bitCount = bitString.getBitCount();
return typeFactory.createSqlType(SqlTypeName.BINARY, bitCount / 8);
case CHAR:
NlsString string = (NlsString) value;
Charset charset = string.getCharset();
if (null == charset) {
charset = typeFactory.getDefaultCharset();
}
SqlCollation collation = string.getCollation();
if (null == collation) {
collation = SqlCollation.COERCIBLE;
}
RelDataType type = typeFactory.createSqlType(SqlTypeName.CHAR, string.getValue().length());
type = typeFactory.createTypeWithCharsetAndCollation(type, charset, collation);
return type;
case INTERVAL_YEAR_MONTH:
case INTERVAL_DAY_TIME:
SqlIntervalLiteral.IntervalValue intervalValue = (SqlIntervalLiteral.IntervalValue) value;
return typeFactory.createSqlIntervalType(intervalValue.getIntervalQualifier());
case SYMBOL:
return typeFactory.createSqlType(SqlTypeName.SYMBOL);
case INTEGER: // handled in derived class
case TIME: // handled in derived class
case VARCHAR: // should never happen
case VARBINARY: // should never happen
default:
throw Util.needToImplement(toString() + ", operand=" + value);
}
}
