Appender UNION support #372
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This PR adds support for appending data to `UNION` columns. The tag
(field name) of the union must be specified in `beginUnion()` call
before appending the actual value.
Nested unions (or structs inside unions) are not supported.
Example:
```sql
CREATE TABLE tab1 (col1 INTEGER, col2 UNION(u1 INTEGER, u2 VARCHAR))
```
```java
DuckDBAppender appender = conn.createAppender("tab1");
// append row with INTEGER value in UNION
appender
.beginRow()
.append(1)
.beginUnion("u1")
.append(42)
.endUnion()
.endRow();
// append row with VARCHAR value in UNION
appender
.beginRow()
.append(2)
.beginUnion("u2")
.append("foo")
.endUnion()
.endRow();
```
Testing: existing test is extended to cover `UNION`s.
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This is a backport of the PR duckdb#372 to `v1.4-andium` stable branch. This PR adds support for appending data to `UNION` columns. The tag (field name) of the union must be specified in `beginUnion()` call before appending the actual value. Nested unions (or structs inside unions) are not supported. Example: ```sql CREATE TABLE tab1 (col1 INTEGER, col2 UNION(u1 INTEGER, u2 VARCHAR)) ``` ```java DuckDBAppender appender = conn.createAppender("tab1"); // append row with INTEGER value in UNION appender .beginRow() .append(1) .beginUnion("u1") .append(42) .endUnion() .endRow(); // append row with VARCHAR value in UNION appender .beginRow() .append(2) .beginUnion("u2") .append("foo") .endUnion() .endRow(); ``` Testing: existing test is extended to cover `UNION`s.
staticlibs
added a commit
that referenced
this pull request
Sep 15, 2025
This is a backport of the PR #372 to `v1.4-andium` stable branch. This PR adds support for appending data to `UNION` columns. The tag (field name) of the union must be specified in `beginUnion()` call before appending the actual value. Nested unions (or structs inside unions) are not supported. Example: ```sql CREATE TABLE tab1 (col1 INTEGER, col2 UNION(u1 INTEGER, u2 VARCHAR)) ``` ```java DuckDBAppender appender = conn.createAppender("tab1"); // append row with INTEGER value in UNION appender .beginRow() .append(1) .beginUnion("u1") .append(42) .endUnion() .endRow(); // append row with VARCHAR value in UNION appender .beginRow() .append(2) .beginUnion("u2") .append("foo") .endUnion() .endRow(); ``` Testing: existing test is extended to cover `UNION`s.
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This PR adds support for appending data to
UNIONcolumns. The tag (field name) of the union must be specified inbeginUnion()call before appending the actual value.Nested unions (or structs inside unions) are not supported.
Example:
Testing: existing test is extended to cover
UNIONs.