Zouxxyy commented on code in PR #4638:
URL: https://github.com/apache/paimon/pull/4638#discussion_r1869136857
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paimon-core/src/main/java/org/apache/paimon/schema/SchemaManager.java:
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@@ -254,6 +246,41 @@ public TableSchema createTable(Schema schema, boolean
ignoreIfExistsSame) throws
}
}
+ private TableSchema mergeSchemaForExternalTable(TableSchema oldSchema,
Schema newSchema)
Review Comment:
Spark supports automatic inference the schema of external table
```sql
spark-sql (default)> create table t0 (id int) using parquet;
Time taken: 0.222 seconds
spark-sql (default)> insert into t0 values 1;
Time taken: 1.514 seconds
spark-sql (default)> create table t0_ext using parquet location
'/user/hive/warehouse/t0';
Time taken: 0.231 seconds
spark-sql (default)> select * from t0_ext;
1
Time taken: 0.153 seconds, Fetched 1 row(s)
spark-sql (default)> show create table t0_ext;
CREATE TABLE default.t0_ext (
id INT)
USING parquet
LOCATION '/hive/warehouse/t0'
```
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