object AstExprContext extends ExpressionContext
This is a special context. All other contexts are determined by the Spark query in a generic way. AST support in many cases is an optimization and so it is tagged and checked after it is determined that this operation will run on the GPU. In other cases it is required. In those cases AST support is determined and used when tagging the metas to see if they will work on the GPU or not. This part is not done automatically.
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