Package org.apache.calcite.schema

Interface SchemaVersion

  • All Known Implementing Classes:
    LongSchemaVersion
    public interface SchemaVersion
    An interface to represent a version ID that can be used to create a read-consistent view of a Schema. This interface assumes a strict partial ordering contract that is:
    1. irreflexive: !a.isBefore(a), which means a cannot happen before itself;
    2. transitive: if a.isBefore(b) and b.isBefore(c) then a.isBefore(c);
    3. antisymmetric: if a.isBefore(b) then !b.isBefore(a).
    Implementation classes of this interface must also override equals(Object), hashCode() and toString().
    See Also:
    Schema.snapshot(SchemaVersion)

    • Method Detail

      • isBefore

        boolean isBefore​(SchemaVersion other)
        Returns if this Version happens before the other Version.
        Parameters:
        other - the other Version object