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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2022/02/11 08:51:11 UTC
[GitHub] [iotdb] Alima777 opened a new pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Alima777 opened a new pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046
Path in where clause is not included in measurements of specific device.
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[GitHub] [iotdb] Alima777 commented on a change in pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
Alima777 commented on a change in pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046#discussion_r805119273
##########
File path: server/src/main/java/org/apache/iotdb/db/qp/physical/crud/RawDataQueryPlan.java
##########
@@ -54,6 +56,19 @@ public IExpression getExpression() {
public void setExpression(IExpression expression) throws QueryProcessException {
this.expression = expression;
+ updateDeviceMeasurementsUsingExpression(expression);
+ }
Review comment:
> `all the devices will be saved in deviceToMeasurements`
That's not right. In align by device query, there is a map `<device -> expression>`, so one expression will only include current device.
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[GitHub] [iotdb] JackieTien97 commented on a change in pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
JackieTien97 commented on a change in pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046#discussion_r805118110
##########
File path: server/src/main/java/org/apache/iotdb/db/qp/physical/crud/RawDataQueryPlan.java
##########
@@ -54,6 +56,19 @@ public IExpression getExpression() {
public void setExpression(IExpression expression) throws QueryProcessException {
this.expression = expression;
+ updateDeviceMeasurementsUsingExpression(expression);
+ }
Review comment:
* `setExpression` will be called twice, once in `transformFilterOperatorToExpression` of `QueryOperator` which generating logical plan, once in `QueryRouter` after optimizing this expression. Although it won't make it it doesn't affect its correctness, the performance may be worse than before.
* In align by device query, the `deviceToMeasurements` should only contains current device, in your current implementation, all the devices will be saved in `deviceToMeasurements`, even if the devices that has been traversed.
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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] commented on pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046#issuecomment-1041058788
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[GitHub] [iotdb] JackieTien97 commented on a change in pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
JackieTien97 commented on a change in pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046#discussion_r805225410
##########
File path: server/src/main/java/org/apache/iotdb/db/qp/physical/crud/RawDataQueryPlan.java
##########
@@ -54,6 +56,19 @@ public IExpression getExpression() {
public void setExpression(IExpression expression) throws QueryProcessException {
this.expression = expression;
+ updateDeviceMeasurementsUsingExpression(expression);
+ }
Review comment:
> Oh, Why don't we move `optimizing this expression` from `QueryRouter` to `QueryOperator` when generating this expression, then setExpression will be invoked only once.
It sounds ok, you can move the optimization logic from `QueryRouter` to `transformQuery` function of `PhysicalGenerator`. I found that only `rawQuery`, `aggregate`, `groupBy` and `udtfQuery` call the `optimize` function, you can figure it out whether other queries can apply that `optimize`.
##########
File path: server/src/main/java/org/apache/iotdb/db/qp/physical/crud/RawDataQueryPlan.java
##########
@@ -54,6 +56,19 @@ public IExpression getExpression() {
public void setExpression(IExpression expression) throws QueryProcessException {
this.expression = expression;
+ updateDeviceMeasurementsUsingExpression(expression);
+ }
Review comment:
> > `all the devices will be saved in deviceToMeasurements`
>
> That's not right. In align by device query, there is a map `<device -> expression>`, so one expression will only include current device.
I see, although different devices share the same `RawDataQueryPlan`, `setDeduplicatedPaths` of `RawDataQueryPlan` will call `clear()` function of `deviceToMeasurements`.
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[GitHub] [iotdb] Alima777 commented on a change in pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
Alima777 commented on a change in pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046#discussion_r805119273
##########
File path: server/src/main/java/org/apache/iotdb/db/qp/physical/crud/RawDataQueryPlan.java
##########
@@ -54,6 +56,19 @@ public IExpression getExpression() {
public void setExpression(IExpression expression) throws QueryProcessException {
this.expression = expression;
+ updateDeviceMeasurementsUsingExpression(expression);
+ }
Review comment:
> `all the devices will be saved in deviceToMeasurements`
That's not right. In align by device query, there is a map `<device -> expression>`, so one expression will only include current device.
--
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[GitHub] [iotdb] JackieTien97 commented on a change in pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
JackieTien97 commented on a change in pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046#discussion_r805225410
##########
File path: server/src/main/java/org/apache/iotdb/db/qp/physical/crud/RawDataQueryPlan.java
##########
@@ -54,6 +56,19 @@ public IExpression getExpression() {
public void setExpression(IExpression expression) throws QueryProcessException {
this.expression = expression;
+ updateDeviceMeasurementsUsingExpression(expression);
+ }
Review comment:
> Oh, Why don't we move `optimizing this expression` from `QueryRouter` to `QueryOperator` when generating this expression, then setExpression will be invoked only once.
It sounds ok, you can move the optimization logic from `QueryRouter` to `transformQuery` function of `PhysicalGenerator`. I found that only `rawQuery`, `aggregate`, `groupBy` and `udtfQuery` call the `optimize` function, you can figure it out whether other queries can apply that `optimize`.
##########
File path: server/src/main/java/org/apache/iotdb/db/qp/physical/crud/RawDataQueryPlan.java
##########
@@ -54,6 +56,19 @@ public IExpression getExpression() {
public void setExpression(IExpression expression) throws QueryProcessException {
this.expression = expression;
+ updateDeviceMeasurementsUsingExpression(expression);
+ }
Review comment:
> > `all the devices will be saved in deviceToMeasurements`
>
> That's not right. In align by device query, there is a map `<device -> expression>`, so one expression will only include current device.
I see, although different devices share the same `RawDataQueryPlan`, `setDeduplicatedPaths` of `RawDataQueryPlan` will call `clear()` function of `deviceToMeasurements`.
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[GitHub] [iotdb] sonarcloud[bot] removed a comment on pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] removed a comment on pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046#issuecomment-1036022467
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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] commented on pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046#issuecomment-1041063509
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[GitHub] [iotdb] JackieTien97 merged pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
JackieTien97 merged pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046
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[GitHub] [iotdb] Alima777 commented on a change in pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
Alima777 commented on a change in pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046#discussion_r805118982
##########
File path: server/src/main/java/org/apache/iotdb/db/qp/physical/crud/RawDataQueryPlan.java
##########
@@ -54,6 +56,19 @@ public IExpression getExpression() {
public void setExpression(IExpression expression) throws QueryProcessException {
this.expression = expression;
+ updateDeviceMeasurementsUsingExpression(expression);
+ }
Review comment:
Oh, Why don't we move `optimizing this expression` from `QueryRouter` to `QueryOperator` when generating this expression, then setExpression will be invoked only once.
--
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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] commented on pull request #5046:
URL: https://github.com/apache/iotdb/pull/5046#issuecomment-1036022467
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[GitHub] [iotdb] sonarcloud[bot] removed a comment on pull request #5046: [To rel/0.12] [IOTDB-2532] Query with align by device can't get value after clear cache
Posted by GitBox <gi...@apache.org>.
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