public ExprNodeGenericFuncDesc getOriginalExpr() {
    return originalExpr;
  }
Constructs a search condition, which takes the form
<pre>column-ref comparison-op constant-value</pre>.

@param columnDesc column being compared

@param comparisonOp comparison operator, e.g. "="
(taken from GenericUDFBridge.getUdfName())

@param constantDesc constant value to search for

@param indexExpr the comparison expression for the index

@param originalExpr the original comparison expression
ql/src/java/org/apache/hadoop/hive/ql/index/IndexSearchCondition.java