Why does Apache Doris currently not support the ClickHouse Map data type? Is there a specific reason for this limitation?

[DemonJun]

Why does Apache Doris currently not support the ClickHouse Map data type? Is there a specific reason for this limitation?

[zclllyybb]

we do have Map type. https://doris.apache.org/zh-CN/docs/3.0/sql-manual/basic-element/sql-data-types/semi-structured/MAP. What are you referring to?

[DemonJun]

When I read data from a ClickHouse table in Doris 3.x via JDBC, the ClickHouse table has a field map<String, String>. At this point, Doris will throw an error, prompting: Execution failed: Error Failed to execute sql: java.sql.SQLException: (conn=15242) errCode = 2, detailMessage = type UNSUPPORTED is unsupported for Nereids

[DemonJun]

By examining the source code of Doris, I found that there is no field mapping for map in the jdbcTypeToDoris method of JdbcClickhouseClient.