ydb/yql/essentials/tests/s-expressions/suites/Casts/AlterToOverVariant.yqls

(

(library "alterto.yql")
(import alterto_module '"alterto.yql")

(let config (DataSource 'config))

### Tuple

(let srcType (VariantType (TupleType (DataType 'Int32) (DataType 'String))))
(let targetType (VariantType (TupleType (DataType 'Uint8) (DataType 'Utf8))))
(let failValue (Variant (Utf8 '"not converted") '1 targetType))

# Variant<Tuple<Int32, String>> -> Variant<Tuple<Uint8, Utf8>>
(let value (Variant (String 'one) '1 srcType))
(let world (Apply (bind alterto_module 'doAlterTo) world value targetType failValue))

# Variant<Tuple<Int32, String>> -> Variant<Tuple<Uint8, Utf8>> (fail)
(let value (Variant (String '"garbage\xff") '1 srcType))
(let world (Apply (bind alterto_module 'doAlterTo) world value targetType failValue))

### Struct
(let srcType (VariantType (StructType '('a (DataType 'Int32)) '('b (DataType 'String)))))
(let targetType (VariantType (StructType '('a (DataType 'Uint8)) '('b (DataType 'Utf8)))))
(let failValue (Variant (Uint8 '123) 'a targetType))

# Variant<Struct<Int32, String>> -> Variant<Struct<Uint8, Utf8>>
(let value (Variant (Int32 '1) 'a srcType))
(let world (Apply (bind alterto_module 'doAlterTo) world value targetType failValue))

# Variant<Struct<Int32, String>> -> Variant<Struct<Uint8, Utf8>> (fail)
(let value (Variant (Int32 '"-1") 'a srcType))
(let world (Apply (bind alterto_module 'doAlterTo) world value targetType failValue))

(return world)

)