Appender UNION support (1.4)#382
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staticlibs merged 1 commit intoduckdb:v1.4-andiumfrom Sep 15, 2025
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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.
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This is a backport of the PR #372 to
v1.4-andiumstable branch.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.