@Override
    void setMultiInsertToken(ASTNode child) {
      set(PreCboCtx.Type.MULTI_INSERT, child);
    }
The context that doPhase1 uses to populate information pertaining to CBO
(currently, this is used for CTAS and insert-as-select).
ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java