Improve SHOW TAG KEYS performance. #9073
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ghost
assigned 
e-dard
suggested changes
Nov 7, 2017
coordinator/statement_executor.go
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| @@ -932,6 +934,98 @@ func (e *StatementExecutor) executeShowSubscriptionsStatement(stmt *influxql.Sho | |||
| return rows, nil | |||
| } | |||
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| func (e *StatementExecutor) executeShowTagKeys(q *influxql.ShowTagKeysStatement, ctx *query.ExecutionContext) error { | |||
| var dis []meta.DatabaseInfo | |||
| if q.Database != "" { | |||
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I don't think that q.Database can be empty. The StatementRewriter should have set it I think. Did you encounter a case where it was empty?
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I think you're right. Not sure where I was thinking it could be empty. Fixed in 156f25a.
coordinator/statement_executor.go
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| } | ||
| dis = []meta.DatabaseInfo{*di} | ||
| } else { | ||
| dis = e.MetaClient.Databases() |
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I don't think SHOW TAG VALUES should work across databases.
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Fixed in 156f25a.
tsdb/store.go
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| switch e := e.(type) { | ||
| case *influxql.BinaryExpr: | ||
| // Remove time clause from condition | ||
| if ref, ok := e.LHS.(*influxql.VarRef); ok && strings.ToLower(ref.Val) == "time" { |
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The time clause should already be removed by influxql.ConditionExpr in the StatementExecutor I think.
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Removed in 156f25a.
benbjohnson
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