Examples of org.apache.cassandra.cql.common.RowSourceDef

org.apache.cassandra.cql.common.RowSourceDef

The abstract notion of a row source definition. A row source is literally just anything that returns rows back. The concrete implementations of row source might be things like a column family row source, a "super column family" row source, a table row source, etc. Note: Instances of sub-classes of this class are part of the "shared" execution plan of CQL. And hence they should not contain any mutable (i.e. session specific) execution state. Mutable state, such a bind variable values (corresponding to say a rowKey or a column Key) are note part of the RowSourceDef tree. [Eventually the notion of a "mutable" portion of the RowSource (RowSourceMut) will be introduced to hold session-specific execution state of the RowSource. For example, this would be needed when implementing iterator style rowsources that yields rows back one at a time as opposed to returning them in one shot.]


        CFMetaData cfMetaData = getColumnFamilyInfo(columnFamilySpec);
        ConstantOperand rowKey = new ConstantOperand(getRowKey(columnFamilySpec));
        int dimensionCnt = numColumnDimensions(columnFamilySpec);


        RowSourceDef rwsDef;
        if ("Super".equals(cfMetaData.columnType))
        {
            if (dimensionCnt > 2)
            {
                // We don't expect this case to arise, since Cql.g grammar disallows this.

Examples of org.apache.cassandra.cql.common.RowSourceDef

Related Classes of org.apache.cassandra.cql.common.RowSourceDef