feat: implement postgres style table partitioning - #776
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… storage
Add declarative RANGE/HASH partitioning to CREATE NODE TABLE:
CREATE NODE TABLE t (...) PARTITION BY (HASH|RANGE) (col) PARTITIONS n;
Each partition is backed by its own node-table subgraph (<t>_p<i>); the
logical parent owns the schema but no physical storage. Reads on the parent
(MATCH) transparently union over every partition via the existing multi-table
node scan. Writes to the parent (COPY/CREATE/MERGE) raise an actionable error
until routing lands; the partition subgraphs are directly writable.
- Parser: PARTITION BY clause + new keywords (regenerated grammar)
- Catalog: parent + partition subgraph entries, persistence (storage v44),
DROP cascade
- Storage: parents skipped in create/checkpoint/serialize/rollback; partitions
managed as ordinary node tables
- Query: expand parent label to partition subgraphs for scanning
- Validation: partition column must be an eligible existing column
- Tests: ddl/partitioned.test (5 cases) pass
- Docs: docs/partitioning.md with architecture and roadmap (write routing,
pruning, ADBC remote partitions)
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Writes are not routed yet.
Idea: store partitioned tables in subgraphs which could live on object storage and/or accessed via a columnar network protocol.