Cardinal number estimating method and cardinal number estimating device under multi-section query condition of big data
A query condition and big data technology, applied in the field of big data computing, can solve the problem of not supporting cardinality statistics, and achieve the effects of reducing calculation errors, improving update efficiency, and high query efficiency
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[0045] Example 1
[0046] A cardinality estimation method under the condition of multi-interval query of big data, comprising the following steps:
[0047] Step 1: The big data is pre-divided into multiple partitions according to numerical attributes, and each partition stores a segment of the data source in the big data, and the partitions are arranged in an orderly manner;
[0048] Step 2: Establish a tree-shaped index structure, each partition is used as a node of the tree-shaped index structure, each node is used to record the maximum and minimum values of the corresponding partition, and a data file and a cardinality estimator are set in each node;
[0049] Step 3: Obtain the data source to be written into the tree index structure, and perform inverted index processing on the data source supporting the interval query condition;
[0050] Step 4: Write the corresponding part of the data source processed by the inverted index into the data file and the cardinality estimat...
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