sql: surface sampled query plan, database name, and execution nodes to internal node statement statistics table by THardy98 · Pull Request #65782 · cockroachdb/cockroach

THardy98 · 2021-05-27T15:47:55Z

This change adds the database name, sampled query plan, and execution nodes of a query statement to the crdb_internal.node_statement_statistics table.

Example of result:

demo@127.0.0.1:26257/movr> select sample_plan, database_name, exec_node_ids from crdb_internal.node_statement_statistics where key = 'SELECT city, revenue FROM rides LIMIT _';
                                                                                      sample_plan                                                                                     | database_name | exec_node_ids
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------+----------------
  {"Children": [], "Estimated Row Count": "10 (2.0% of the table; stats collected 36 seconds ago)", "Limit": "10", "Name": "scan", "Spans": "LIMITED SCAN", "Table": "rides@primary"} | movr          | {1}
(1 row)

Time: 9ms total (execution 8ms / network 0ms)

Example sample plan JSON formatted:

{
   "Children":[],
   "Estimated Row Count":"10 (2.0% of the table; stats collected 36 seconds ago)",
   "Limit":"10",
   "Name":"scan",
   "Spans":"LIMITED SCAN",
   "Table":"rides@primary"
}

Through this change, 3rd party tools and partners are now able to consume this information for their use.

Resolves #65013
Resolves #65285

Release note (sql change): Added sample_plan, database_name, and exec_node_ids columns to crdb_internal.node_statement_statistics table. Allows for 3rd party and partner consumption of this data.

cockroach-teamcity · 2021-05-27T15:48:04Z

This change is

maryliag

Great work!
Just a few comments:

the PR should have just one commit, to you can squash the 3 into 1
the PR name should have the the package name and all lower case, so sql: surface sampled query....
On the description add info about what the PR is about, a link to the issue with Resolves #number and a Release note

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @THardy98)

pkg/sql/crdb_internal.go, line 948 at r1 (raw file):

				}

				// createSamplePlan is a go closure function that builds a JSON object

you don't need to get in such details about what type of go function is this, you can go with

// createSamplePlan builds a formatted  JSON object from the explain tree nodes.

THardy98

done

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THardy98

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pkg/sql/crdb_internal.go, line 948 at r1 (raw file):

Previously, maryliag (Marylia Gutierrez) wrote…

you don't need to get in such details about what type of go function is this, you can go with
// createSamplePlan builds a formatted  JSON object from the explain tree nodes.

done

maryliag

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @maryliag and @THardy98)

pkg/sql/crdb_internal.go, line 970 at r2 (raw file):

				// createSamplePlan builds a formatted  JSON object from the explain tree nodes.
				var createSamplePlan func(node *roachpb.ExplainTreePlanNode) *json.ObjectBuilder
				createSamplePlan = func(node *roachpb.ExplainTreePlanNode) *json.ObjectBuilder {

I think is better to remove the creation of this function from here, we can even add to a utils so other places can use it too

maryliag

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @maryliag and @THardy98)

pkg/sql/crdb_internal.go, line 970 at r2 (raw file):

Previously, maryliag (Marylia Gutierrez) wrote…

I think is better to remove the creation of this function from here, we can even add to a utils so other places can use it too

you can also just moved to the top along with the other functions

Azhng

Great work! 👏

Also remember to update the release note section in your commit message.

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @maryliag and @THardy98)

pkg/sql/crdb_internal.go, line 968 at r2 (raw file):

				}

				// createSamplePlan builds a formatted  JSON object from the explain tree nodes.

nit: extra space here between "formatted" and "JSON"

pkg/sql/crdb_internal.go, line 969 at r2 (raw file):

				// createSamplePlan builds a formatted  JSON object from the explain tree nodes.
				var createSamplePlan func(node *roachpb.ExplainTreePlanNode) *json.ObjectBuilder

Also, I think you can just return the json.JSON object instead of the builder.

pkg/sql/crdb_internal.go, line 970 at r2 (raw file):

Previously, maryliag (Marylia Gutierrez) wrote…

you can also just moved to the top along with the other functions

Also it would be nice if you can add some tests for this function once you extracted it.

pkg/sql/crdb_internal.go, line 972 at r2 (raw file):

				createSamplePlan = func(node *roachpb.ExplainTreePlanNode) *json.ObjectBuilder {

					nodePlan := json.NewObjectBuilder(3)

Two things here:

usually if we are passing a constant literal to a function, we usually add an inline comment with the parameter name behind that constant. So in this case, it would be: json.NewObjectBuilder(3 /* numAddsHint */)
Why 3 in this case? Would be nice to add a comment explaining it.

pkg/sql/crdb_internal.go, line 979 at r2 (raw file):

					for _, attr := range node.Attrs {
						attrBuilder := json.NewObjectBuilder(1)

ditto

pkg/sql/crdb_internal.go, line 996 at r2 (raw file):

				samplePlan := createSamplePlan(&s.mu.data.SensitiveInfo.MostRecentPlanDescription)

				execNodeIds := tree.NewDArray(types.Int)

nit: s/execNodeIds/execNodeIDs/

pkg/sql/crdb_internal.go, line 997 at r2 (raw file):

				execNodeIds := tree.NewDArray(types.Int)
				for _, nodeId := range s.mu.data.Nodes {

nit: s/nodeId/nodeID/

THardy98

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @Azhng, @maryliag, and @THardy98)

pkg/sql/crdb_internal.go, line 968 at r2 (raw file):

Previously, Azhng (Archer Zhang) wrote…

nit: extra space here between "formatted" and "JSON"

done

pkg/sql/crdb_internal.go, line 972 at r2 (raw file):

Previously, Azhng (Archer Zhang) wrote…

Two things here:

usually if we are passing a constant literal to a function, we usually add an inline comment with the parameter name behind that constant. So in this case, it would be: json.NewObjectBuilder(3 /* numAddsHint */)

Why 3 in this case? Would be nice to add a comment explaining it.

done

pkg/sql/crdb_internal.go, line 979 at r2 (raw file):

Previously, Azhng (Archer Zhang) wrote…

ditto

done

pkg/sql/crdb_internal.go, line 996 at r2 (raw file):

execNodeIDs
done

pkg/sql/crdb_internal.go, line 997 at r2 (raw file):

Previously, Azhng (Archer Zhang) wrote…

nit: s/nodeId/nodeID/

done

THardy98

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @Azhng and @maryliag)

pkg/sql/crdb_internal.go, line 969 at r2 (raw file):

Previously, Azhng (Archer Zhang) wrote…

Also, I think you can just return the json.JSON object instead of the builder.

done

pkg/sql/crdb_internal.go, line 970 at r2 (raw file):

Previously, Azhng (Archer Zhang) wrote…

Also it would be nice if you can add some tests for this function once you extracted it.

Extracted function, put it just above the table with other util functions used for the node_statement_statistics (e.g. getSQLStats).
Exported the function so it could be used in the unit testing file.

maryliag

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @Azhng, @maryliag, and @THardy98)

pkg/sql/crdb_internal_test.go, line 514 at r3 (raw file):

// correctly builds a JSON object from an ExplainTreePlanNode.
func TestExplainTreePlanNodeToJSON(t *testing.T) {
	// Test using a node with multiple inner children.

You can organize this by creating one list of objects with your input and expected result, so e.g.

testData := []struct {
		explainTree     roachpb.ExplainTreePlanNode
		expected string
	}{
		{	roachpb.ExplainTreePlanNode{.     <-- here is multiInner
		Name: "root",.....
,
			`{"attrs": [{"rootKey": "rootValue"}].....`},
		{	roachpb.ExplainTreePlanNode{.     <-- here is multiAttr
		Name: "root",.....
,
			`{"attrs": [{"rootKey": "rootValue"}].....`},
		{	roachpb.ExplainTreePlanNode{.     <--- here is multiChild
		Name: "root",.....
,
			`{"attrs": [{"rootKey": "rootValue"}].....`},
	}

	for _, test := range testData {
                	resultJSON := sql.ExplainTreePlanNodeToJSON(&test.explainTree)
	                require.Equal(t, test.expected, resultJSON.String())
	}

maryliag

Reviewed 1 of 2 files at r2.
Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @Azhng, @maryliag, and @THardy98)

pkg/sql/crdb_internal.go, line 849 at r3 (raw file):

}

// explainTreePlanNodeToJSON builds a formatted JSON object from the explain tree nodes.

nit: capitalize first letter ExplainTreePlanNodeToJSON

THardy98

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pkg/sql/crdb_internal.go, line 849 at r3 (raw file):

Previously, maryliag (Marylia Gutierrez) wrote…

nit: capitalize first letter ExplainTreePlanNodeToJSON

done

pkg/sql/crdb_internal_test.go, line 514 at r3 (raw file):

Previously, maryliag (Marylia Gutierrez) wrote…

You can organize this by creating one list of objects with your input and expected result, so e.g.

testData := []struct {
		explainTree     roachpb.ExplainTreePlanNode
		expected string
	}{
		{	roachpb.ExplainTreePlanNode{.     <-- here is multiInner
		Name: "root",.....
,
			`{"attrs": [{"rootKey": "rootValue"}].....`},
		{	roachpb.ExplainTreePlanNode{.     <-- here is multiAttr
		Name: "root",.....
,
			`{"attrs": [{"rootKey": "rootValue"}].....`},
		{	roachpb.ExplainTreePlanNode{.     <--- here is multiChild
		Name: "root",.....
,
			`{"attrs": [{"rootKey": "rootValue"}].....`},
	}

	for _, test := range testData {
                	resultJSON := sql.ExplainTreePlanNodeToJSON(&test.explainTree)
	                require.Equal(t, test.expected, resultJSON.String())
	}

done

maryliag

Changes look good, a few things missing:

Changing your commit message as Archer mentioned (your commit must have all the info, not just the PR)
There is some tests failing that you need to update, some about the table node_statement_statistics that now has more columns
The tests are on TeamCity: https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_UnitTests/3023812?
e.g. pkg/sql/logictest/testdata/logic_test/create_statements

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @Azhng, @maryliag, and @THardy98)

pkg/sql/crdb_internal_test.go, line 631 at r4 (raw file):

		explainTreeJSON := sql.ExplainTreePlanNodeToJSON(&testData.explainTree)
		expected := testData.expected
		require.Equal(t, expected, explainTreeJSON.String())

there is not need to create the expected variable, you can use testData.expected directly

THardy98

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pkg/sql/crdb_internal_test.go, line 631 at r4 (raw file):

Previously, maryliag (Marylia Gutierrez) wrote…

there is not need to create the expected variable, you can use testData.expected directly

Done.

Azhng

Great work! Almost there. Just one more nit from me and seems like you might need to fix more tests in the CI 😛

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @maryliag and @THardy98)

pkg/sql/crdb_internal_test.go, line 501 at r5 (raw file):

	var dbName string

	_, err := sqlDB.Exec(`SET database = defaultdb`)

nit: might worth to add additional require.Equal before calling SET database = defaultdb to ensure the database name is what you expected prior to this statement. Also, since it seems like this test is checking for SQL outputs of the crdb_internal.node_statement_statistics view and it's not really touching the internals of the code, you can simply just use logic test for it. It would be a lot cleaner since you can avoid a lot of boilerplate code.

THardy98

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pkg/sql/crdb_internal_test.go, line 501 at r5 (raw file):

Previously, Azhng (Archer Zhang) wrote…

nit: might worth to add additional require.Equal before calling SET database = defaultdb to ensure the database name is what you expected prior to this statement. Also, since it seems like this test is checking for SQL outputs of the crdb_internal.node_statement_statistics view and it's not really touching the internals of the code, you can simply just use logic test for it. It would be a lot cleaner since you can avoid a lot of boilerplate code.

Removed the unit test, created a logic test as per your suggestion.

maryliag

Nice!
from the changes I requested
Make sure you got the approval from Archer from his requests too

@kevin-v-ngo if you don't mind taking a look if you're happy with the format of the plan. Thanks!

Reviewable status: complete! 1 of 0 LGTMs obtained (waiting on @Azhng and @maryliag)

Azhng

Nice!

Just make sure to wait for kevin to take a final look at plan format.

Reviewable status: complete! 2 of 0 LGTMs obtained (waiting on @Azhng and @maryliag)

Azhng

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pkg/sql/crdb_internal.go, line 854 at r6 (raw file):

	// Create a new json.ObjectBuilder with 3 key-value pairs for the node's name,
	// a single node attribute, and the node's children.
	nodePlan := json.NewObjectBuilder(3 /* numAddsHint */)

Should it still be 3 here in this case now that we are just flattening the attribute trees?

…o internal node statement statistics table This change adds the database name, sampled query plan, and execution nodes of a query statement to the crdb_internal.node_statement_statistics table. Through this change, 3rd party tools and partners are now able to consume this information for their use. Resolves cockroachdb#65013 Resolves cockroachdb#65285 Release note (sql change): Added sample_plan, database_name, and exec_node_ids columns to crdb_internal.node_statement_statistics table. Allows for 3rd party and partner consumption of this data.

THardy98 · 2021-06-08T12:37:20Z

Reviewable status: complete! 0 of 0 LGTMs obtained (and 2 stale) (waiting on @Azhng, @maryliag, and @THardy98)

pkg/sql/crdb_internal.go, line 854 at r6 (raw file):
	// Create a new json.ObjectBuilder with 3 key-value pairs for the node's name,
	// a single node attribute, and the node's children.
	nodePlan := json.NewObjectBuilder(3 /* numAddsHint */)
Should it still be 3 here in this case now that we are just flattening the attribute trees?

No, should be: number of attributes + name + children -> num attributes + 2.
Fixed.

Azhng

Awesome work!

Reviewable status: complete! 0 of 0 LGTMs obtained (and 2 stale) (waiting on @maryliag and @THardy98)

pkg/sql/crdb_internal.go, line 854 at r6 (raw file):

Previously, THardy98 (Thomas Hardy) wrote…

No, should be: number of attributes + name + children -> num attributes + 2.
Fixed.

NICE 🎉

maryliag

Reviewable status: complete! 0 of 0 LGTMs obtained (and 2 stale) (waiting on @maryliag and @THardy98)

kevin-v-ngo · 2021-06-08T15:51:29Z

Looks good Thomas! Thanks for updating the format!

THardy98 · 2021-06-08T15:56:44Z

bors r+

craig · 2021-06-08T17:30:34Z

Build failed (retrying...):

GitHub CI (Cockroach)

craig · 2021-06-08T19:04:17Z

Build succeeded:

GitHub CI (Cockroach)

Previously, we store statement plan as a byte blob column in system.statement_statistics. As of cockroachdb#65782 we now support JSON encoding for the plan. This commit change the column type for plan from BYTES to JSONB in system.statement_statistics. Release note (sql change): using JSONB to store statement plan instead of BYTES in system.statement_statistics.

67331: sql: store plan as jsonb in system.statement_statistics r=maryliag a=Azhng Previously, we store statement plan as a byte blob column in system.statement_statistics. As of #65782 we now support JSON encoding for the plan. This commit change the column type for plan from BYTES to JSONB in system.statement_statistics. Release note (sql change): using JSONB to store statement plan instead of BYTES in system.statement_statistics. 67340: opt: fix FoldEqZeroSTDistance with use_spheroid argument r=otan a=mgartner The `FoldEqZeroSTDistance` normalization rule normalizes expressions in the form `st_distance(a, b) = 0` to `st_intersects(a, b)`. This normalization rule is important because it allows an inverted index to be used for more queries. Previously, `FoldEqZeroSTDistance` did not handle the third argument of `st_distance` for the geography overload, `use_spheroid`. The optimizer panicked when a user supplied this third argument because it attempted to find an `st_intersects` overload with the three arguments and no such overload exists. In addition to the panic, this rule was incorrectly firing in cases where it shouldn't have. From the [`ST_Distance` PostGIS docs](https://postgis.net/docs/ST_Distance.html): > For geography types defaults to return the minimum geodesic distance > between two geographies in meters, compute on the spheroid determined > by the SRID. If use_spheroid is false, a faster spherical calculation > is used. From the [`ST_Intersects` PostGIS docs](https://postgis.net/docs/ST_Intersects.html): > For geography, this function has a distance tolerance of about 0.00001 > meters and uses the sphere rather than spheroid calculation. In summary, `st_distance` calculates on a spheroid by default, and only on a sphere if `use_spheroid` is explicitly false. `st_intersects` calculates on the sphere always. Therefore, this rule can only apply for geography types if `use_spheroid=false` is explicitly passed. This commit ensures that `FoldEqZeroSTDistance` only matches `st_distance` functions with geography arguments if `use_spheroid=false` is included in the function call. The panic is fixed by stripping the `use_spheroid` argument from the list of arguments used to lookup the `st_intersects` overload. Fixes #67235 Release note (bug fix): Two bugs have been fixed which affected geospatial queries with the `st_distance` function. The first caused errors for filters of the form `st_distance(g1, g2, use_spheroid) = 0`. The second could cause incorrect results in some cases. It incorrectly transformed filters in the form `st_distance(g1, g2) = 0` when `g1` and `g2` are geographies to `st_instersects(g1, g2)`. This is not a valid transformation because `st_distance` makes spheroid-based calculations by default while `st_intersects` only makes sphere-based calculations. 67371: dev: move `dev` back to `cockroach` r=rail a=rickystewart We don't seem to be getting any benefit out of having it in its own repo, and having it in the same repo gives us more flexibility. Closes #67339. Release note: None 67390: roachtest: fix ruby-pg roachtest r=rafiss a=RichardJCai Helper file was moved but path was not updated. Release note: None 67393: roachtest: fix gorm by installing test deps r=RichardJCai a=rafiss fixes #66825 I think this started failing with the move to go1.16. I added these steps to match what gorm does in its own test suite. Release note: None Co-authored-by: Azhng <archer.xn@gmail.com> Co-authored-by: Marcus Gartner <marcus@cockroachlabs.com> Co-authored-by: Ricky Stewart <ricky@cockroachlabs.com> Co-authored-by: richardjcai <caioftherichard@gmail.com> Co-authored-by: Rafi Shamim <rafi@cockroachlabs.com>

THardy98 requested a review from a team May 27, 2021 15:47

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THardy98 changed the title ~~Surface sampled query plan, database name, and execution nodes to internal node statement statistics table~~ sql: surface sampled query plan, database name, and execution nodes to internal node statement statistics table May 27, 2021

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craig bot merged commit 05d6726 into cockroachdb:master Jun 8, 2021

Azhng mentioned this pull request Jul 7, 2021

sql: store plan as jsonb in system.statement_statistics #67331

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jseldess mentioned this pull request Sep 8, 2021

sql: surface sampled query plan, database name, and execution nodes to internal node statement statistics table cockroachdb/docs#11344

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THardy98 commented May 27, 2021 •

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