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add rate and increase special functions

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This commit is contained in:
Sven Klemm
2018-07-12 09:57:04 +02:00
parent 2784a2df6b
commit bbe7b9b908
1 changed files with 35 additions and 7 deletions
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42
public/app/plugins/datasource/postgres/postgres_query.ts
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@ -219,20 +219,48 @@ export default class PostgresQuery {
buildValueColumns(target) {
let query = '';
for (let i = 0; i < this.selectModels.length; i++) {
query += ', ' + this.buildValueColumn(target, this.selectModels[i]);
for (let i = 0; i < target.select.length; i++) {
query += ', ' + this.buildValueColumn(target, target.select[i]);
}
return query;
}
buildValueColumn(target, column) {
let selectText = '';
for (let i = 0; i < column.length; i++) {
let part = column[i];
selectText = part.render(selectText);
let query = '';
let columnName = _.find(column, (g: any) => g.type === 'column');
query = columnName.params[0];
let aggregate = _.find(column, (g: any) => g.type === 'aggregate');
if (aggregate) {
query = aggregate.params[0] + '(' + query + ')';
}
return selectText;
let special = _.find(column, (g: any) => g.type === 'special');
if (special) {
let over = '';
if (target.metricColumn) {
over = 'PARTITION BY ' + target.metricColumn;
}
switch (special.params[0]) {
case 'increase':
query = query + ' - lag(' + query + ') OVER ()';
break;
case 'rate':
let timeColumn = target.timeColumn;
query = '(' + query + ' - lag(' + query + ') OVER (' + over + '))';
query += '/extract(epoch from ' + timeColumn + ' - lag(' + timeColumn + ') OVER (' + over + '))';
break;
}
}
let alias = _.find(column, (g: any) => g.type === 'alias');
if (alias) {
query += ' AS ' + this.quoteIdentifier(alias.params[0]);
}
return query;
}
buildWhereClause(target) {