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https://issues.apache.org/jira/browse/CASSGO-118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18071450#comment-18071450
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Bohdan Siryk commented on CASSGO-118:
-------------------------------------
The issue comes from this
[code|https://github.com/apache/cassandra-gocql-driver/blob/c65c762b83eccdb6a6a083c123a5935c4302745c/marshal.go#L2857-L2875]:
# Iterating over the elements of the udt type
# Check if the name of the UDT field is presented in the provided map
# Map is nil, so _*val, ok := v[udt.Elements[i].Name]*_ doesn't panic and *_ok
= false_*
# Skip marshaling as ok is false
# adds _*data*_ in result _*buf*_ by calling _*appendBytes*_ which encodes
length of appended bytes as -1
> Nil map for UDT column inserts zero-valued UDT instead of NULL
> --------------------------------------------------------------
>
> Key: CASSGO-118
> URL: https://issues.apache.org/jira/browse/CASSGO-118
> Project: Apache Cassandra Go driver
> Issue Type: Bug
> Reporter: Bohdan Siryk
> Priority: Normal
>
> Inserting a row with a nil map for a UDT-typed column results in a non-NULL
> value whose fields behave like defaults / zero values, instead of storing
> NULL for the whole UDT.
> *Expected*
> The UDT column is NULL in DB.
> *Actual*
> The UDT column is present (not NULL) and fields appear as type defaults
> (empty string, 0, false, etc.).
> To reproduce it, please use this code snippet on github gist:
> https://gist.github.com/worryg0d/22810cd6609cae985ca5c53725c3e3ae
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