public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
RelDataType type1 = opBinding.getOperandType(0);
RelDataType type2 = opBinding.getOperandType(1);
if (SqlTypeUtil.isExactNumeric(type1) && SqlTypeUtil.isExactNumeric(type2)) {
if (SqlTypeUtil.isDecimal(type1) || SqlTypeUtil.isDecimal(type2)) {
int p1 = type1.getPrecision();
int p2 = type2.getPrecision();
int s1 = type1.getScale();
int s2 = type2.getScale();
int scale = Math.max(s1, s2);
assert scale <= SqlTypeName.MAX_NUMERIC_SCALE;
int precision = Math.max(p1 - s1, p2 - s2) + scale + 1;
precision = Math.min(precision, SqlTypeName.MAX_NUMERIC_PRECISION);
assert precision > 0;
RelDataType ret;
ret = opBinding.getTypeFactory().createSqlType(SqlTypeName.DECIMAL, precision, scale);
return ret;
}
}
return null;
}
/** @pre SqlTypeUtil.sameNamedType(argTypes[0], (argTypes[1])) */
public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
final RelDataType argType0 = opBinding.getOperandType(0);
final RelDataType argType1 = opBinding.getOperandType(1);
if (!(SqlTypeUtil.inCharOrBinaryFamilies(argType0)
&& SqlTypeUtil.inCharOrBinaryFamilies(argType1))) {
Util.pre(
SqlTypeUtil.sameNamedType(argType0, argType1),
"SqlTypeUtil.sameNamedType(argTypes[0], argTypes[1])");
}
SqlCollation pickedCollation = null;
if (SqlTypeUtil.inCharFamily(argType0)) {
if (!SqlTypeUtil.isCharTypeComparable(opBinding.collectOperandTypes().subList(0, 2))) {
throw opBinding.newError(
RESOURCE.typeNotComparable(
argType0.getFullTypeString(), argType1.getFullTypeString()));
}
pickedCollation =
SqlCollation.getCoercibilityDyadicOperator(
argType0.getCollation(), argType1.getCollation());
assert null != pickedCollation;
}
// Determine whether result is variable-length
SqlTypeName typeName = argType0.getSqlTypeName();
if (SqlTypeUtil.isBoundedVariableWidth(argType1)) {
typeName = argType1.getSqlTypeName();
}
RelDataType ret;
ret =
opBinding
.getTypeFactory()
.createSqlType(typeName, argType0.getPrecision() + argType1.getPrecision());
if (null != pickedCollation) {
RelDataType pickedType;
if (argType0.getCollation().equals(pickedCollation)) {
pickedType = argType0;
} else if (argType1.getCollation().equals(pickedCollation)) {
pickedType = argType1;
} else {
throw Util.newInternal("should never come here");
}
ret =
opBinding
.getTypeFactory()
.createTypeWithCharsetAndCollation(
ret, pickedType.getCharset(), pickedType.getCollation());
}
return ret;
}
public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
RelDataType type1 = opBinding.getOperandType(0);
if (SqlTypeUtil.isDecimal(type1)) {
if (type1.getScale() == 0) {
return type1;
} else {
int p = type1.getPrecision();
RelDataType ret;
ret = opBinding.getTypeFactory().createSqlType(SqlTypeName.DECIMAL, p, 0);
if (type1.isNullable()) {
ret = opBinding.getTypeFactory().createTypeWithNullability(ret, true);
}
return ret;
}
}
return null;
}
