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/usr/share/gocode/src/github.com/influxdata/influxdb/influxql/cast.go is in golang-github-influxdb-influxdb-dev 1.1.1+dfsg1-4.

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package influxql

func castToFloat(v interface{}) float64 {
	switch v := v.(type) {
	case float64:
		return v
	case int64:
		return float64(v)
	default:
		return float64(0)
	}
}

func castToInteger(v interface{}) int64 {
	switch v := v.(type) {
	case float64:
		return int64(v)
	case int64:
		return v
	default:
		return int64(0)
	}
}

func castToString(v interface{}) string {
	switch v := v.(type) {
	case string:
		return v
	default:
		return ""
	}
}

func castToBoolean(v interface{}) bool {
	switch v := v.(type) {
	case bool:
		return v
	default:
		return false
	}
}