feat: influxql support show measurements (#795)

* feat: influxql support show measurements

* fix CI

integration_tests/cases/common/dml/case_sensitive.result

@@ -97,3 +97,7 @@ DESC `CASE_SENSITIVE_TABLE1`;
 
 Failed to execute query, err: Server(ServerError { code: 500, msg: "Failed to create plan, query: DESC `CASE_SENSITIVE_TABLE1`;. Caused by: Failed to create plan, err:Table not found, table:CASE_SENSITIVE_TABLE1" })
 
+DROP TABLE IF EXISTS case_SENSITIVE_table1;
+
+affected_rows: 0
+

integration_tests/cases/common/dml/case_sensitive.sql

@@ -49,3 +49,5 @@ DESC CASE_SENSITIVE_TABLE1;
 DESC `case_SENSITIVE_table1`;
 
 DESC `CASE_SENSITIVE_TABLE1`;
+
+DROP TABLE IF EXISTS case_SENSITIVE_table1;

integration_tests/cases/common/dml/insert_mode.result

@@ -201,3 +201,7 @@ UInt64(0),Timestamp(2),UInt32(20),String("123"),UInt32(21),UInt32(22),UInt32(4),
 UInt64(0),Timestamp(3),UInt32(30),String("123"),UInt32(31),UInt32(32),UInt32(5),
 
 
+DROP TABLE IF EXISTS `03_dml_insert_mode_table4`;
+
+affected_rows: 0
+

integration_tests/cases/common/dml/insert_mode.sql

@@ -131,4 +131,5 @@ FROM
 ORDER BY
     `c1` ASC;
 
-DROP TABLE `03_dml_insert_mode_table4`;   
+
+DROP TABLE IF EXISTS `03_dml_insert_mode_table4`;

integration_tests/cases/common/dml/issue-302.result

@@ -1,3 +1,7 @@
+DROP TABLE IF EXISTS issue302;
+
+affected_rows: 0
+
 CREATE TABLE `issue302` (`name` string TAG NULL, `value` double NOT NULL, `t` timestamp NOT NULL, TIMESTAMP KEY(t)) ENGINE=Analytic with (enable_ttl='false');
 
 affected_rows: 0
@@ -12,3 +16,7 @@ issue302.t,COUNT(DISTINCT issue302.name),
 Timestamp(1651737067000),Int64(0),
 
 
+DROP TABLE IF EXISTS issue302;
+
+affected_rows: 0
+

integration_tests/cases/common/dml/issue-302.sql

@@ -1,5 +1,9 @@
+DROP TABLE IF EXISTS issue302;
+
 CREATE TABLE `issue302` (`name` string TAG NULL, `value` double NOT NULL, `t` timestamp NOT NULL, TIMESTAMP KEY(t)) ENGINE=Analytic with (enable_ttl='false');
 
 INSERT INTO issue302(t,  value) VALUES(1651737067000, 100);
 
 select `t`, count(distinct name) from issue302 group by `t`;
+
+DROP TABLE IF EXISTS issue302;

integration_tests/cases/common/dml/issue-59.result

@@ -28,3 +28,7 @@ String("logical_plan"),String("Projection: issue59.id + Int64(1), COUNT(DISTINCT
 String("physical_plan"),String("ProjectionExec: expr=[issue59.id + Int64(1)@0 as issue59.id + Int64(1), COUNT(DISTINCT issue59.account)@1 as COUNT(DISTINCT issue59.account)]\n  ProjectionExec: expr=[group_alias_0@0 as issue59.id + Int64(1), COUNT(alias1)@1 as COUNT(DISTINCT issue59.account)]\n    AggregateExec: mode=FinalPartitioned, gby=[group_alias_0@0 as group_alias_0], aggr=[COUNT(alias1)]\n      CoalesceBatchesExec: target_batch_size=8192\n        RepartitionExec: partitioning=Hash([Column { name: \"group_alias_0\", index: 0 }], 8), input_partitions=8\n          AggregateExec: mode=Partial, gby=[group_alias_0@0 as group_alias_0], aggr=[COUNT(alias1)]\n            AggregateExec: mode=FinalPartitioned, gby=[group_alias_0@0 as group_alias_0, alias1@1 as alias1], aggr=[]\n              CoalesceBatchesExec: target_batch_size=8192\n                RepartitionExec: partitioning=Hash([Column { name: \"group_alias_0\", index: 0 }, Column { name: \"alias1\", index: 1 }], 8), input_partitions=8\n                  AggregateExec: mode=Partial, gby=[CAST(id@0 AS Int64) + 1 as group_alias_0, account@1 as alias1], aggr=[]\n                    ScanTable: table=issue59, parallelism=8, order=None, \n"),
 
 
+DROP TABLE IF EXISTS issue59;
+
+affected_rows: 0
+

integration_tests/cases/common/dml/issue-59.sql

@@ -16,3 +16,5 @@ GROUP BY id+1;
 explain SELECT id+1, count(distinct(account))
 FROM issue59
 GROUP BY id+1;
+
+DROP TABLE IF EXISTS issue59;

integration_tests/cases/common/dml/issue-637.result

@@ -63,3 +63,11 @@ tsid,t,double_filed,float_filed,str_field,var_field,u64_field,u32_field,u16_fiel
 UInt64(0),Timestamp(1651737067000),Double(100.0),Float(100.0),String("s"),Varbinary([118]),UInt64(100),UInt32(100),UInt16(100),UInt8(100),Int64(100),Int32(100),Int16(100),Int8(100),Boolean(false),
 
 
+DROP TABLE IF EXISTS issue637;
+
+affected_rows: 0
+
+DROP TABLE IF EXISTS issue637_1;
+
+affected_rows: 0
+

integration_tests/cases/common/dml/issue-637.sql

@@ -46,3 +46,7 @@ VALUES
     (1651737067000,100,100,"s","v",100,100,100,100,100,100,100,100,false);
 
 SELECT * FROM `issue637_1`;
+
+DROP TABLE IF EXISTS issue637;
+
+DROP TABLE IF EXISTS issue637_1;

integration_tests/cases/env/local/influxql/basic.result

@@ -39,6 +39,11 @@ SELECT "level_description", location, water_level FROM "h2o_feet" where location
 
 {"results":[{"statement_id":0,"series":[{"name":"h2o_feet","columns":["time","level_description","location","water_level"],"values":[[1439827200000,"below 3 feet","santa_monica",2.064],[1439827560000,"below 3 feet","santa_monica",2.116],[1439827620000,"below 3 feet","santa_monica",2.028]]}]}]}
 
+-- SQLNESS ARG protocol=influxql
+show measurements;
+
+{"results":[{"statement_id":0,"series":[{"name":"measurements","columns":["name"],"values":[["h2o_feet"]]}]}]}
+
 DROP TABLE IF EXISTS `h2o_feet`;
 
 affected_rows: 0

integration_tests/cases/env/local/influxql/basic.sql

@@ -35,4 +35,7 @@ SELECT * FROM "h2o_feet";
 -- SQLNESS ARG protocol=influxql
 SELECT "level_description", location, water_level FROM "h2o_feet" where location = 'santa_monica';
 
+-- SQLNESS ARG protocol=influxql
+show measurements;
+
 DROP TABLE IF EXISTS `h2o_feet`;

interpreters/src/show.rs

@@ -13,7 +13,7 @@ use regex::Regex;
 use snafu::{Backtrace, OptionExt, ResultExt, Snafu};
 use sql::{
     ast::ShowCreateObject,
-    plan::{ShowCreatePlan, ShowPlan, ShowTablesPlan},
+    plan::{QueryType, ShowCreatePlan, ShowPlan, ShowTablesPlan},
 };
 
 use crate::{
@@ -127,17 +127,37 @@ impl ShowInterpreter {
                 .map(|t| t.name().to_string())
                 .collect::<Vec<_>>(),
         };
-        let schema = DataSchema::new(vec![Field::new(
-            SHOW_TABLES_COLUMN_SCHEMA,
-            DataType::Utf8,
-            false,
-        )]);
-        let record_batch = RecordBatch::try_new(
-            Arc::new(schema),
-            vec![Arc::new(StringArray::from(tables_names))],
-        )
-        .context(CreateRecordBatch)?;
 
+        let record_batch = match plan.query_type {
+            QueryType::Sql => {
+                let schema = DataSchema::new(vec![Field::new(
+                    SHOW_TABLES_COLUMN_SCHEMA,
+                    DataType::Utf8,
+                    false,
+                )]);
+
+                RecordBatch::try_new(
+                    Arc::new(schema),
+                    vec![Arc::new(StringArray::from(tables_names))],
+                )
+                .context(CreateRecordBatch)?
+            }
+            QueryType::InfluxQL => {
+                // TODO: refactor those constants
+                let schema = DataSchema::new(vec![
+                    Field::new("ceresdb::measurement", DataType::Utf8, false),
+                    Field::new("name", DataType::Utf8, false),
+                ]);
+
+                let measurements = vec!["measurements".to_string(); tables_names.len()];
+                let measurements = Arc::new(StringArray::from(measurements));
+                RecordBatch::try_new(
+                    Arc::new(schema),
+                    vec![measurements, Arc::new(StringArray::from(tables_names))],
+                )
+                .context(CreateRecordBatch)?
+            }
+        };
         let record_batch = record_batch.try_into().context(ToCommonRecordType)?;
 
         Ok(Output::Records(vec![record_batch]))

server/src/handlers/influxdb.rs

@@ -208,7 +208,7 @@ impl From<&str> for Precision {
 /// Query string parameters for query api(by influxql)
 ///
 /// It's derived from query string parameters of query described in
-/// doc of influxdb 1.8:     
+/// doc of influxdb 1.8:
 ///     https://docs.influxdata.com/influxdb/v1.8/tools/api/#query-string-parameters-1
 ///
 /// NOTE:
@@ -311,6 +311,8 @@ impl InfluxqlResultBuilder {
             }
         );
 
+        // Query like `show measurements`, there will be not timestamp.
+        let has_timestamp = column_schemas.iter().any(|c| c.data_type.is_timestamp());
         // Find the tags part and columns part from schema.
         let mut group_by_col_idxs = Vec::new();
         let mut value_col_idxs = Vec::new();
@@ -324,7 +326,7 @@ impl InfluxqlResultBuilder {
         });
 
         // The group by tags will be placed after measurement and before time column.
-        let mut searching_group_by_tags = true;
+        let mut searching_group_by_tags = has_timestamp;
         for (idx, col) in col_iter {
             if col.data_type.is_timestamp() {
                 searching_group_by_tags = false;

sql/src/influxql/planner.rs

@@ -9,13 +9,14 @@ use influxql_logical_planner::planner::InfluxQLToLogicalPlan;
 use influxql_parser::{
     common::{MeasurementName, QualifiedMeasurementName},
     select::{MeasurementSelection, SelectStatement},
+    show_measurements::ShowMeasurementsStatement,
     statement::Statement as InfluxqlStatement,
 };
 use snafu::{ensure, ResultExt};
 
 use crate::{
     influxql::{error::*, provider::InfluxSchemaProviderImpl},
-    plan::{Plan, QueryPlan},
+    plan::{Plan, QueryPlan, QueryType, ShowPlan, ShowTablesPlan},
     provider::{ContextProviderAdapter, MetaProvider},
 };
 
@@ -36,15 +37,15 @@ impl<'a, P: MetaProvider> Planner<'a, P> {
     /// the [InfluxqlStatement] will be converted to [SqlStatement] first,
     /// and build plan then.
     pub fn statement_to_plan(self, stmt: InfluxqlStatement) -> Result<Plan> {
-        match &stmt {
+        match stmt {
             InfluxqlStatement::Select(_) => self.select_to_plan(stmt),
+            InfluxqlStatement::ShowMeasurements(stmt) => self.show_measurements_to_plan(*stmt),
             InfluxqlStatement::CreateDatabase(_)
             | InfluxqlStatement::ShowDatabases(_)
             | InfluxqlStatement::ShowRetentionPolicies(_)
             | InfluxqlStatement::ShowTagKeys(_)
             | InfluxqlStatement::ShowTagValues(_)
             | InfluxqlStatement::ShowFieldKeys(_)
-            | InfluxqlStatement::ShowMeasurements(_)
             | InfluxqlStatement::Delete(_)
             | InfluxqlStatement::DropMeasurement(_)
             | InfluxqlStatement::Explain(_) => Unimplemented {
@@ -54,7 +55,16 @@ impl<'a, P: MetaProvider> Planner<'a, P> {
         }
     }
 
-    pub fn select_to_plan(self, stmt: InfluxqlStatement) -> Result<Plan> {
+    // TODO: support offset/limit/match in stmt
+    fn show_measurements_to_plan(self, _stmt: ShowMeasurementsStatement) -> Result<Plan> {
+        let plan = ShowTablesPlan {
+            pattern: None,
+            query_type: QueryType::InfluxQL,
+        };
+        Ok(Plan::Show(ShowPlan::ShowTablesPlan(plan)))
+    }
+
+    fn select_to_plan(self, stmt: InfluxqlStatement) -> Result<Plan> {
         if let InfluxqlStatement::Select(select_stmt) = &stmt {
             check_select_statement(select_stmt)?;
         } else {

sql/src/plan.rs

@@ -161,10 +161,17 @@ pub struct ShowCreatePlan {
     pub obj_type: ShowCreateObject,
 }
 
+#[derive(Debug, PartialEq, Eq)]
+pub enum QueryType {
+    Sql,
+    InfluxQL,
+}
+
 #[derive(Debug, PartialEq, Eq)]
 pub struct ShowTablesPlan {
     /// Like pattern
     pub pattern: Option<String>,
+    pub query_type: QueryType,
 }
 
 #[derive(Debug)]

sql/src/planner.rs

@@ -55,7 +55,8 @@ use crate::{
     partition::PartitionParser,
     plan::{
         AlterTableOperation, AlterTablePlan, CreateTablePlan, DescribeTablePlan, DropTablePlan,
-        ExistsTablePlan, InsertPlan, Plan, QueryPlan, ShowCreatePlan, ShowPlan, ShowTablesPlan,
+        ExistsTablePlan, InsertPlan, Plan, QueryPlan, QueryType, ShowCreatePlan, ShowPlan,
+        ShowTablesPlan,
     },
     promql::{ColumnNames, Expr as PromExpr},
     provider::{ContextProviderAdapter, MetaProvider},
@@ -992,6 +993,7 @@ impl<'a, P: MetaProvider> PlannerDelegate<'a, P> {
     fn show_tables_to_plan(&self, show_tables: ShowTables) -> Result<Plan> {
         let plan = ShowTablesPlan {
             pattern: show_tables.pattern,
+            query_type: QueryType::Sql,
         };
         Ok(Plan::Show(ShowPlan::ShowTablesPlan(plan)))
     }
@@ -2193,6 +2195,7 @@ mod tests {
     ShowTablesPlan(
         ShowTablesPlan {
             pattern: None,
+            query_type: Sql,
         },
     ),
 )"#,