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LakeShen commented on CALCITE-5912: ----------------------------------- Hi [~julianhyde] ,I have got your point,thank you very much for your guidance > Add an implementation of TABLESAMPLE in Enumerable convention > ------------------------------------------------------------- > > Key: CALCITE-5912 > URL: https://issues.apache.org/jira/browse/CALCITE-5912 > Project: Calcite > Issue Type: New Feature > Reporter: LakeShen > Priority: Major > > In Calcite, the TableSample SQL statement will be converted to Sample RelNode > plan tree,for example: > {code:java} > select * from emp tablesample bernoulli(10){code} > The plan is : > {code:java} > LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4], > SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8]) > Sample(mode=[bernoulli], rate=[10.0], repeatableSeed=[-]) > LogicalTableScan(table=[[CATALOG, SALES, EMP]]) {code} > Currently in enumerable mode, we don't have EnumerableSample, So we can't add > TableSample quidem tests (such as in misc.iq). > After this jira,we could add the quidem test for TableSample(such as > tablesample.iq),although TableSample's results are inconclusive when the 0 < > sample rate < 100, but TampeSample(0) is certain result. -- This message was sent by Atlassian Jira (v8.20.10#820010)