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https://issues.apache.org/jira/browse/CALCITE-3120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16864620#comment-16864620
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Stamatis Zampetakis commented on CALCITE-3120:
----------------------------------------------
Thanks for the clarification [~sereda]. I see better now.
Small question: who is going to rewrite A = B into B = A, Calcite or Mongo? I
am asking since we have many tests which verify the execution plan by comparing
strings and most of the time the behavior of Calcite is deterministic (the same
query ends up producing the same plan). If that didn't happen we would have
failures every day.
> MongoAdapterTest.testGroupByAvgSumCount fails due the order of sort query
> -------------------------------------------------------------------------
>
> Key: CALCITE-3120
> URL: https://issues.apache.org/jira/browse/CALCITE-3120
> Project: Calcite
> Issue Type: Bug
> Components: mongodb-adapter
> Affects Versions: 1.19.0
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
>
> The MongoAdapterTest.testGroupByAvgSumCount fails because $sort operator does
> not appear at the middle of the query but in the end.
> {noformat}
> org.junit.ComparisonFailure:
> expected and actual Mongo queries (pipelines) do not match
> expected:<...$project" : {
> "[POP" : "$pop",
> "STATE" : "$state"
> }
> }
> {
> "$group" : {
> "_id" : "$STATE",
> "_1" : {
> "$sum" : "$POP"
> },
> "_2" : {
> "$sum" : {
> "$cond" : [{
> "$eq" : ["POP", null]
> }, 0, 1]
> }
> }
> }
> }
> {
> "$project" : {
> "STATE" : "$_id",
> "_1" : "$_1",
> "_2" : "$_2"
> }
> }
> {
> "$sort" : {
> "STATE" : 1
> }
> }
> {
> "$project" : {
> "STATE" : 1,
> "A" : {
> "$divide" : [{
> "$cond" : [{
> "$eq" : ["$_2", {
> "$literal" : 0
> }]
> }, null, "$_1"]
> }, "$_2"]
> },
> "S" : {
> "$cond" : [{
> "$eq" : ["$_2", {
> "$literal" : 0
> }]
> }, null, "$_1"]
> },
> "C" : "$_2"]
> }
> }> but was:<...$project" : {
> "[STATE" : "$state",
> "POP" : "$pop"
> }
> }
> {
> "$group" : {
> "_id" : "$STATE",
> "_1" : {
> "$sum" : "$POP"
> },
> "_2" : {
> "$sum" : {
> "$cond" : [{
> "$eq" : ["POP", null]
> }, 0, 1]
> }
> }
> }
> }
> {
> "$project" : {
> "STATE" : "$_id",
> "_1" : "$_1",
> "_2" : "$_2"
> }
> }
> {
> "$project" : {
> "STATE" : 1,
> "A" : {
> "$divide" : [{
> "$cond" : [{
> "$eq" : ["$_2", {
> "$literal" : 0
> }]
> }, null, "$_1"]
> }, "$_2"]
> },
> "S" : {
> "$cond" : [{
> "$eq" : ["$_2", {
> "$literal" : 0
> }]
> }, null, "$_1"]
> },
> "C" : "$_2"
> }
> }
> {
> "$sort" : {
> "STATE" : 1]
> }
> }>
> {noformat}
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