[BUG] fix 4149, add sessionVariable to choose broadcastjoin first when cardinality cannot be estimated #4150
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…n cardinality cannot be estimated
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…n cardinality cannot be estimated (apache#4150) Change-Id: I92f458e353657fe2410430cb8e6c0b60a24441cb
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fix #4149
add sessionVariable "prefer_broadcast_join" to choose broadcastjoin first when cardinality cannot be estimated
the sessionVariable can set local or global. the default value is true, prefer broadcast join first where the two cost is equal.