worryg0d commented on code in PR #1942:
URL:
https://github.com/apache/cassandra-gocql-driver/pull/1942#discussion_r3109537715
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cluster.go:
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@@ -458,6 +465,38 @@ type SchemaListenersConfig struct {
AggregateChangeListener AggregateChangeListener
}
+// Holds configuration of encoding / decoding behavior of the driver.
+type EncodingConfig struct {
+ // Turns on the encoding nil maps as initialized UDTs for UDTs.
+ // This is a lagacy behavior and it is enabled by default for backward
compatibility, but it will be disabled in the next major version
+ // If this is enabled, then nil maps will be encoded as an initilizied
UDT object in which each field is set to NULL.
+ //
+ // For example, there are following UDT and table definitions:
+ //
+ // ```cql
+ // CREATE TYPE my_udt (field_a text, field_b int);
+ // CREATE TABLE my_table (id int PRIMARY KEY, value frozen<my_udt>);
+ // ```
+ //
+ // The following code will insert a UDT object with both fields set to
NULL:
+ //
+ // ```go
+ // var nilMap map[string]interface{} = nil
+ // session.Query("INSERT INTO my_table (id, value) VALUES (?, ?)", 1,
nilMap).Exec()
+ // ```
+ //
+ // The table my_table will contain:
+ //
+ // id | value
+ // 1 | {field_a: null, field_b: null}
+ // ---+-------------------------------
+ //
+ // Default: true
+ EncodeNilMapAsInitilizedUDT bool
+ // Supresses the warning that is emitted when
EncodeNilMapAsInitilizedUDT is enabled.
+ SuppressEncodeNilMapAsInitilizedUDTWarning bool
Review Comment:
Decoding depends on what is written in the DB:
1. Null value - gocql decodes as nil map
2. something like this `{street: null, zip: null}` - gocql decodes as udt
with null values
The behavior is consistent between v1.7 and v2
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