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fix(bridge): handle information schema #245
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Signed-off-by: Alex Chi <[email protected]>
yliang412
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Nov 23, 2024
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| let (schema, table) = if let Some((schema, table)) = name.split_once('.') { | ||
| (schema, table) | ||
| } else { | ||
| ("public", name) | ||
| }; | ||
| let schema = if schema == "information_schema" { | ||
| // This is `INFORMATION_SCHEMA` but datafusion didn't expose this constant. | ||
| // Also, note that we didn't check `session_state.is_information_schema_enabled()` so this schema is always | ||
| // available. | ||
| Arc::new(InformationSchemaProvider::new(Arc::clone(&self.catalog))) | ||
| } else if let Some(schema) = catalog.schema(schema) { | ||
| schema | ||
| } else { | ||
| panic!("schema not found in datafusion catalog: {}", schema) | ||
| }; | ||
| let Some(table) = futures_lite::future::block_on(schema.table(table.as_ref())) else { | ||
| panic!("table not found in datafusion catalog: {}", name); | ||
| }; |
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I feel using datafusion's resolve method makes it cleaner:
https://github.com/cmu-db/optd/blob/d5b0239d22cc4416635a099830cd82da1491b7b8/optd-datafusion-bridge/src/lib.rs#L174-L181
I had it while drafting https://github.com/cmu-db/optd/pull/233
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The information schema is not in datafusion's catalog. It is handled differently as in the upstream source code:
https://github.com/apache/datafusion/blob/c0ca4b4e449e07c3bcd6f3593fa31dd31ed5e0c5/datafusion/core/src/execution/session_state.rs#L301-L311
Therefore, we added this special case in the df-bridge.