LDC-Q2001 — The query reads a relation the snapshot does not have

What it means

Every source in a query names a relation — the table of rows to read, such as rules, nodes, or labels. The snapshot carries a fixed set of relations, and the engine checks each name against that set before reading anything. An unknown name stops the query, and the message lists the relations that do exist, so a typo is easy to spot.

Pick the intended relation from the listed names. When the data really lives elsewhere, point the source at the right package instead of renaming the relation.

Example

LawQL

from r in nosuchrelation select r

Fix

LawQL

from r in rules select r

Engine message

The engine reports this in its own wording:

Output

LDC-Q2001: unknown relation 'nosuchrelation'. Hint: available: anchors, edges, fields, imports, interpretations, labels, links, literals, nodes, norms, positions, rules, variables, windows

Related

• Questions to the engine — the relations a snapshot carries.