fix: make insert plan schema correct and clear #5881

Job	Run time
Build	1m 58s
Build	1m 58s
Lint (clippy)	5m 8s
Lint (clippy)	5m 8s
Node.js Binding Tests	4m 27s
Node.js Binding Tests	4m 27s
Format (rustfmt +nightly)	12s
Format (rustfmt +nightly)	12s
Cache Maintenance	0s
Cache Maintenance	0s
PG Protocol Tests	19s
PG Protocol Tests	19s
Python Binding Tests	6m 8s
Python Binding Tests	6m 8s
Process Integration Tests (pytest)	1m 17s
Process Integration Tests (pytest)	1m 17s
SQL Logic Tests (postgres)	11s
SQL Logic Tests (postgres)	11s
SQL Logic Tests (flightsql)	12s
SQL Logic Tests (flightsql)	12s
Unit Tests	5m 58s
Unit Tests	5m 58s
SQL Logic Tests (rpc)	10s
SQL Logic Tests (rpc)	10s
MinIO Integration Tests (SLT::MinIO)	2m 30s
MinIO Integration Tests (SLT::MinIO)	2m 30s
Service Integration Tests (SLT)	4m 40s
Service Integration Tests (SLT)	4m 40s
Datasource Integration (Clickhouse)	37s
Datasource Integration (Clickhouse)	2m 41s
Datasource Integration (Cassandra)	40s
Datasource Integration (Cassandra)	1m 55s
Datasource Integration (Mysql)	23s
Datasource Integration (Mysql)	2m 54s
Datasource Integration (MongoDB)	30s
Datasource Integration (MongoDB)	37s
Datasource Integration (Sqlserver)	39s
Datasource Integration (Sqlserver)	9m 8s
Snowflake Integration Tests (SLT::Snowflake)	2m 7s
Snowflake Integration Tests (SLT::Snowflake)	2m 7s
	1h 30m 38s

Provide feedback