/**
* Returns whether the type of an array of expressions is compatible with a struct type.
*
* @param exprs Array of expressions
* @param type Type
* @param fail Whether to fail if there is a mismatch
* @return Whether every expression has the same type as the corresponding member of the struct
* type
* @see RelOptUtil#eq(String, RelDataType, String, RelDataType, boolean)
*/
public static boolean compatibleTypes(RexNode[] exprs, RelDataType type, boolean fail) {
final RelDataTypeField[] fields = type.getFields();
if (exprs.length != fields.length) {
assert !fail : "rowtype mismatches expressions";
return false;
}
for (int i = 0; i < fields.length; i++) {
final RelDataType exprType = exprs[i].getType();
final RelDataType fieldType = fields[i].getType();
if (!RelOptUtil.eq("type1", exprType, "type2", fieldType, fail)) {
return false;
}
}
return true;
}
/**
* Returns whether the leading edge of a given array of expressions is wholly {@link RexInputRef}
* objects with types corresponding to the underlying datatype.
*/
public static boolean containIdentity(RexNode[] exprs, RelDataType rowType, boolean fail) {
final RelDataTypeField[] fields = rowType.getFields();
if (exprs.length < fields.length) {
assert !fail : "exprs/rowType length mismatch";
return false;
}
for (int i = 0; i < fields.length; i++) {
if (!(exprs[i] instanceof RexInputRef)) {
assert !fail : "expr[" + i + "] is not a RexInputRef";
return false;
}
RexInputRef inputRef = (RexInputRef) exprs[i];
if (inputRef.getIndex() != i) {
assert !fail : "expr[" + i + "] has ordinal " + inputRef.getIndex();
return false;
}
if (!RelOptUtil.eq("type1", exprs[i].getType(), "type2", fields[i].getType(), fail)) {
return false;
}
}
return true;
}