# Select API Quickstart Guide [![Slack](https://slack.min.io/slack?type=svg)](https://slack.min.io)

Traditional retrieval of objects is always as whole entities, i.e GetObject for a 5 GiB object, will always return 5 GiB of data. S3 Select API allows us to retrieve a subset of data by using simple SQL expressions. By using Select API to retrieve only the data needed by the application, drastic performance improvements can be achieved.

        // if more than one conflicting project dependencies
        // let the delegate resolver select among them
        if (projectCandidates != null) {
            ConflictResolverDetails<T> projectDetails = new DefaultConflictResolverDetails<>(Cast.<List<T>>uncheckedCast(projectCandidates));
            delegate.select(projectDetails);
            details.select(projectDetails.getSelected());
            return;
        }

 MatMul 20
 Maximum 1
 Mul 74
 NoOp 13
 Reshape 86
 RsqrtGrad 1
 Select 36
 SigmoidGrad 24
 Slice 32
 StridedSlice 2
 Sub 1
 Sum 11
 TanhGrad 17
 Tile 2
 ZerosLike 1
cluster 16 size 22
 Add 2
 BiasAdd 1
 ConcatV2 1
 Const 3
 GreaterEqual 1
 MatMul 1
 Mul 3
 Select 3
 Shape 1
 Sigmoid 3
 Split 1
 Tanh 2
cluster 17 size 60
 Add 2

stdout 'yes' # flag.go should select yes
! stdout 'no' # flag.go should not select no

go generate -skip th..sand './generate/flag.go'
stdout 'yes' # flag.go should select yes
! stdout 'no' # flag.go should not select no

go generate -run . -skip th..sand './generate/flag.go'
stdout 'yes' # flag.go should select yes
! stdout 'no' # flag.go should not select no

		}
	}
}

func (e *SelectExpression) analyze(s *Select) (result qProp) {
	if e.All {
		return qProp{isRowFunc: true}
	}

	for _, ex := range e.Expressions {
		result.combine(ex.analyze(s))
	}
	return
}

func (e *AliasedExpression) analyze(s *Select) qProp {
	return e.Expression.analyze(s)
}

func (e *Expression) analyze(s *Select) (result qProp) {
	for _, ac := range e.And {

                "test".getBytes(StandardCharsets.UTF_8), service.select(Arrays.asList("SHA-1", "MD5")));
        assertNotNull(checksums);
        assertEquals(2, checksums.size());
        assertEquals("a94a8fe5ccb19ba61c4c0873d391e987982fbbd3", checksums.get(service.select("SHA-1")));
        assertEquals("098f6bcd4621d373cade4e832627b4f6", checksums.get(service.select("MD5")));
    }

    @Test

    (\$p.category): \$results | map(. + {policy: .policies[] | select(.category == \$p.category)}) | {
      level: \$p.level,
      reason: \$p.reason,
      passing: map(select(.policy.fail | not)) | length,
      failing: map(select(.policy.fail)) | length,
      testnames: map(select(.policy.fail) | .testname),
    }
  })
  # add a meta policy based on whether any policy failed
  + {

                }
            }
            """,
        "select 1.1": """{ ComponentSelection selection ->
                if (selection.candidate.version != '1.1') {
                    selection.reject("not 1.1")
                }
                candidates << selection.candidate.version
            }
            """,
        "select 2.0": """{ ComponentSelection selection ->

		if gotRemove != file {
			t.Fatalf("Remove() failed: got %v want %v", gotRemove, file)
		}
		select {
		case <-addedChan:
			t.Fatal("Remove() failed: callback invoked with added=false")
		default:
		}

		wantEvent = fsnotify.Event{Name: file, Op: fsnotify.Write}
		fakeWatcher.InjectEvent(file, wantEvent)
		select {
		case gotEvent := <-watcher.Events(file):
			t.Fatalf("Unexpected Events() after Remove(): got %v", gotEvent)

		clauses := []clause.Interface{clause.Select{}, clause.From{}, clause.Where{Exprs: []clause.Expression{clause.Eq{Column: clause.PrimaryColumn, Value: "1"}, clause.Gt{Column: "age", Value: 18}, clause.Or(clause.Neq{Column: "name", Value: "jinzhu"})}}}

		for _, clause := range clauses {
			stmt.AddClause(clause)
		}

		stmt.Build("SELECT", "FROM", "WHERE")
		_ = stmt.SQL.String()
	}
}