Query¶

Query is a Statement.

Creating Instance¶

Query takes the following to be created:

• NodeLocation
• Select
• Relation
• WindowExpression
• Expression
• GroupBy
• PartitionBy
• Expression
• RefinementInfo
• pullQuery
• Limit

Query is created when:

• EngineExecutor is requested to sourceTablePlan
• StatementRewriter.Rewriter is requested to visitQuery
• AstBuilder.Visitor is requested to visitQuery

pullQuery Flag¶

Query is given a pullQuery flag when created (which is most importantly when AstBuilder.Visitor is requested to visitQuery).

AstBuilder.Visitor turns the pullQuery flag on (true) when the Query has no EMIT clause (and the buildingPersistentQuery internal flag is off).

isPullQuery¶

boolean isPullQuery()

isPullQuery is used when:

• Analyzer.Visitor is requested to visitQuery
• QueryAnalyzer is requested to analyze
• EngineExecutor is requested to executeTablePullQuery
• StatementRewriter.Rewriter is requested to visitQuery
• SqlFormatter.Formatter is requested to visitQuery
• QueryExecutor is requested to handleQuery
• ScalablePushUtil is requested to isScalablePushQuery

accept¶

R accept(
  AstVisitor<R, C> visitor,
  C context)

accept requests the given AstVisitor to visit a Query.

accept is part of the AstNode abstraction.