WindowFunctionSpec spec) throws SemanticException {
WindowFunctionInfo wFnInfo = FunctionRegistry.getWindowFunctionInfo(spec.getName());
if (wFnInfo == null) {
throw new SemanticException(ErrorMsg.INVALID_FUNCTION.getMsg(spec.getName()));
}
WindowFunctionDef def = new WindowFunctionDef();
def.setName(spec.getName());
def.setAlias(spec.getAlias());
def.setDistinct(spec.isDistinct());
def.setExpressionTreeString(spec.getExpression().toStringTree());
def.setStar(spec.isStar());
def.setPivotResult(wFnInfo.isPivotResult());
ShapeDetails inpShape = wdwTFnDef.getRawInputShape();
/*
* translate args
*/
ArrayList<ASTNode> args = spec.getArgs();
if (args != null)
{
for (ASTNode expr : args)
{
PTFExpressionDef argDef = null;
try {
argDef = buildExpressionDef(inpShape, expr);
} catch (HiveException he) {
throw new SemanticException(he);
}
def.addArg(argDef);
}
}
if (FunctionRegistry.isRankingFunction(spec.getName())){
setupRankingArgs(wdwTFnDef, def, spec);
}
WindowSpec wdwSpec = spec.getWindowSpec();
if (wdwSpec != null) {
String desc = spec.toString();
WindowFrameDef wdwFrame = translate(spec.getName(), inpShape, wdwSpec);
if (!wFnInfo.isSupportsWindow())
{
BoundarySpec start = wdwSpec.getWindowFrame().getStart();
if (start.getAmt() != BoundarySpec.UNBOUNDED_AMOUNT) {
throw new SemanticException(
String.format("Expecting left window frame boundary for " +
"function %s to be unbounded. Found : %d", desc, start.getAmt()));
}
BoundarySpec end = wdwSpec.getWindowFrame().getEnd();
if (end.getAmt() != BoundarySpec.UNBOUNDED_AMOUNT) {
throw new SemanticException(
String.format("Expecting right window frame boundary for " +
"function %s to be unbounded. Found : %d", desc, start.getAmt()));
}
}
def.setWindowFrame(wdwFrame);
}
try {
setupWdwFnEvaluator(def);
} catch (HiveException he) {