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handle counter overflow and resets in rate

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This commit is contained in:
Sven Klemm 2018-07-12 13:15:19 +02:00
parent 0935526d23
commit a24a6624e3
1 changed files with 4 additions and 2 deletions
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6
public/app/plugins/datasource/postgres/postgres_query.ts
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@ -240,7 +240,7 @@ export default class PostgresQuery {
let special = _.find(column, (g: any) => g.type === 'special');
if (special) {
let over = '';
if (target.metricColumn) {
if (target.metricColumn !== 'None') {
over = 'PARTITION BY ' + target.metricColumn;
}
switch (special.params[0]) {
@ -249,7 +249,9 @@ export default class PostgresQuery {
break;
case 'rate':
let timeColumn = target.timeColumn;
query = '(' + query + ' - lag(' + query + ') OVER (' + over + '))';
let curr = query;
let prev = 'lag(' + curr + ') OVER (' + over + ')';
query = '(CASE WHEN ' + curr + ' >= ' + prev + ' THEN ' + curr + ' - ' + prev + ' ELSE ' + curr + ' END)';
query += '/extract(epoch from ' + timeColumn + ' - lag(' + timeColumn + ') OVER (' + over + '))';
break;
}