gudusoft.gsqlparser.ir.semantic

Class WindowFrame

Object

gudusoft.gsqlparser.ir.semantic.WindowFrame

public final class WindowFrame
extends Object

Per-output window frame clause (slice 22). When a WindowSpec carries a non-null frame, the SQL projection had a ROWS/RANGE/GROUPS BETWEEN ... clause inside its OVER (...).

Frame is presentation metadata only. The dlineage XML harvests no frame information: DataFlowAnalyzer.generateDataFlow() walks only PARTITION BY / OVER ORDER BY expressions for windowed calls (DataFlowAnalyzer.java:20558-20575). Frame information therefore does NOT appear in the canonical model. Adding canonical edges only on the IR side would manufacture divergence-by-design (same reasoning as slice-13 PARTITION BY refs, slice-21 outer ORDER BY refs).

end is null for the unary form (ROWS UNBOUNDED PRECEDING) which standard SQL treats as BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW; the IR preserves the surface shape rather than expanding it.

The EXCLUDE clause is rejected at build time: Netezza's parser populates TWindowFrameBoundary.getExclusionClause() on the END boundary; lifting requires deciding whether EXCLUDE contributes to row-influence semantics.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	WindowFrame.Unit

Constructor Summary

Constructors

Constructor and Description
WindowFrame(WindowFrame.Unit unit, FrameBound start, FrameBound end)

Method Summary

Modifier and Type	Method and Description
FrameBound	getEnd()
FrameBound	getStart()
WindowFrame.Unit	getUnit()

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WindowFrame

public WindowFrame(WindowFrame.Unit unit,
                   FrameBound start,
                   FrameBound end)

Method Detail

getUnit

public WindowFrame.Unit getUnit()

getStart

public FrameBound getStart()

getEnd

public FrameBound getEnd()