Write to Merge storage #683
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zvonand
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Mar 12, 2025
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| auto database = DatabaseCatalog::instance().getDatabase(table_to_write->database); | ||
| auto table = database->getTable(table_to_write->table, context_); | ||
| return table->write(query, metadata_snapshot, context_, async_insert); |
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What happens if there is no table with given name?
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Error "Table ... does not exists". The same as in attempt to write directly in that non-existed table.
CREATE TABLE test03373_db.test03373_merge_wr_1 (key UInt32, value UInt32) ENGINE=Merge(test03373_db, 'test03373_table_\d+', test03373_table_2);
INSERT INTO test03373_db.test03373_merge_wr_1 VALUES (1,1)
Code: 60. DB::Exception: Received from localhost:9000. DB::Exception: Table test03373_db.test03373_table_2 does not exist. Maybe you meant test03373_db.test03373_merge_ro?. (UNKNOWN_TABLE)
INSERT INTO test03373_db.test03373_table_2 VALUES (1,1)
Code: 60. DB::Exception: Received from localhost:9000. DB::Exception: Table test03373_db.test03373_table_2 does not exist. Maybe you meant test03373_db.test03373_merge_ro?. (UNKNOWN_TABLE)
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…dation Validate access to underlying tables for Merge engine
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Changelog category (leave one):
Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Allow to write to Merge table engine
Documentation entry for user-facing changes
Add ability to write into one of source tables of Merge engine.
Added new optional parameter 'table_to_write':
In this case query
works as
If first parameter 'db_name' is not regular expression, 'table_to_write' can contain only table name, than database is taken from first parameter.
If 'db_name' is regexp, 'table_to_write' must contain full table name with database.