Grammar: fine tune expression inheritance hierarchy

ftsrg / ingraph

Incremental view maintenance for openCypher graph queries.

http://docs.inf.mit.bme.hu/ingraph/

Eclipse Public License 1.0

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Grammar: fine tune expression inheritance hierarchy #292

Closed jmarton closed 6 years ago

jmarton commented 6 years ago

This PR modifies the compiler to follow the clarifying changes to the grammar as described in slizaa/slizaa-opencypher-xtext#33.

Note: the referenced changes introduce incompatible changes to the openCypher Xtext grammar. Upgrading the grammar would break the compiler, and merging this PR should turn it green again.