forked from TrueCloudLab/distribution
89 lines
2.9 KiB
Go
89 lines
2.9 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bigquery
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import (
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"fmt"
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"golang.org/x/net/context"
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bq "google.golang.org/api/bigquery/v2"
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)
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type queryOption interface {
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customizeQuery(conf *bq.JobConfigurationQuery, projectID string)
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}
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// DisableQueryCache returns an Option that prevents results being fetched from the query cache.
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// If this Option is not used, results are fetched from the cache if they are available.
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// The query cache is a best-effort cache that is flushed whenever tables in the query are modified.
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// Cached results are only available when TableID is unspecified in the query's destination Table.
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// For more information, see https://cloud.google.com/bigquery/querying-data#querycaching
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func DisableQueryCache() Option { return disableQueryCache{} }
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type disableQueryCache struct{}
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func (opt disableQueryCache) implementsOption() {}
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func (opt disableQueryCache) customizeQuery(conf *bq.JobConfigurationQuery, projectID string) {
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f := false
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conf.UseQueryCache = &f
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}
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// JobPriority returns an Option that causes a query to be scheduled with the specified priority.
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// The default priority is InteractivePriority.
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// For more information, see https://cloud.google.com/bigquery/querying-data#batchqueries
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func JobPriority(priority string) Option { return jobPriority(priority) }
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type jobPriority string
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func (opt jobPriority) implementsOption() {}
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func (opt jobPriority) customizeQuery(conf *bq.JobConfigurationQuery, projectID string) {
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conf.Priority = string(opt)
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}
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const (
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BatchPriority = "BATCH"
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InteractivePriority = "INTERACTIVE"
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)
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// TODO(mcgreevy): support large results.
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// TODO(mcgreevy): support non-flattened results.
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func (c *Client) query(ctx context.Context, dst *Table, src *Query, options []Option) (*Job, error) {
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job, options := initJobProto(c.projectID, options)
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payload := &bq.JobConfigurationQuery{}
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dst.customizeQueryDst(payload, c.projectID)
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src.customizeQuerySrc(payload, c.projectID)
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for _, opt := range options {
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o, ok := opt.(queryOption)
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if !ok {
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return nil, fmt.Errorf("option (%#v) not applicable to dst/src pair: dst: %T ; src: %T", opt, dst, src)
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}
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o.customizeQuery(payload, c.projectID)
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}
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job.Configuration = &bq.JobConfiguration{
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Query: payload,
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}
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j, err := c.service.insertJob(ctx, job, c.projectID)
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if err != nil {
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return nil, err
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}
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j.isQuery = true
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return j, nil
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}
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