nastra commented on issue #14263:
URL: https://github.com/apache/iceberg/issues/14263#issuecomment-3589001064
I took a quick look and the issue isn't at the REST layer. When a namespace
with a space is URL encoded, you'll get `a+b` and when it's URL decoded, you'll
get the original `a b` namespace. However, not every engine actually supports
spaces in namespace names. For example, **Hive** and the
**SparkSessionCatalog** don't support spaces as can be seen in this validation:
```
[INVALID_SCHEMA_OR_RELATION_NAME] `a b` is not a valid name for
tables/schemas. Valid names only contain alphabet characters, numbers and _.
SQLSTATE: 42602
org.apache.spark.sql.AnalysisException: [INVALID_SCHEMA_OR_RELATION_NAME] `a
b` is not a valid name for tables/schemas. Valid names only contain alphabet
characters, numbers and _. SQLSTATE: 42602
at
org.apache.spark.sql.errors.QueryCompilationErrors$.invalidNameForTableOrDatabaseError(QueryCompilationErrors.scala:1143)
at
org.apache.spark.sql.catalyst.catalog.SessionCatalog.validateName(SessionCatalog.scala:155)
at
org.apache.spark.sql.catalyst.catalog.SessionCatalog.createDatabase(SessionCatalog.scala:293)
at
org.apache.spark.sql.execution.datasources.v2.V2SessionCatalog.createNamespace(V2SessionCatalog.scala:424)
at
org.apache.iceberg.spark.SparkSessionCatalog.createNamespace(SparkSessionCatalog.java:123)
at
org.apache.spark.sql.execution.datasources.v2.CreateNamespaceExec.run(CreateNamespaceExec.scala:49)
```
```
Failed to create namespace a b in Hive Metastore
java.lang.RuntimeException: Failed to create namespace a b in Hive Metastore
at
org.apache.iceberg.hive.HiveCatalog.createNamespace(HiveCatalog.java:507)
at
org.apache.iceberg.spark.SparkCatalog.createNamespace(SparkCatalog.java:499)
at
org.apache.spark.sql.execution.datasources.v2.CreateNamespaceExec.run(CreateNamespaceExec.scala:49)
```
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