join selection
2018-12-22 13:35:10 0 举报spark生成join物理计划策略JoinSelection
作者其他创作
大纲/内容
是
SortMergeJoinExec
否
ShuffledHashJoinExec(right)
spark.sql.join.preferSortMergeJoin=false && !RowOrdering.isOrderable(leftKeys)
canBroadcastByHints
ExtractEquiJoinKeys
根据join类型、hint位置和表大小选取buildSide
根据join类型和两个表相对大小选取buildSide
ShuffledHashJoinExec(left)
RowOrdering.isOrderable(leftKeys)
canBroadcastBySizes
BroadcastHashJoinExec
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