关于sql：没有重复的PostgreSQL多重upsert会出错

PostgreSQL multiple upsert without duplicates rises an error

我使用PostgreSQL 9.5，Ubuntu 16.04

我有一张空桌子：

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CREATE TABLE IF NOT EXISTS candles_1m(
TIMESTAMP REAL PRIMARY KEY,
OPEN REAL,
close REAL,
high REAL,
low REAL,
volume REAL
);

然后我尝试做多个upsert(没有重复的'timestamp' - 主键)：

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INSERT INTO candles_1m (
TIMESTAMP, OPEN, close, high, low, volume
) VALUES
(1507804800, 5160, 5158.7, 5160, 5158.7, 5.40608574),
(1507804740, 5157.5, 5160, 5160, 5156.1, 39.03357813),
(1507804680, 5156.5, 5157.4, 5157.4, 5156, 33.54458319),
(1507804620, 5151.3, 5156.5, 5157.5, 5151.2, 19.75590599)
ON CONFLICT (TIMESTAMP)
DO UPDATE SET
OPEN = EXCLUDED.open,
close = EXCLUDED.close,
high = EXCLUDED.high,
low = EXCLUDED.low,
volume = EXCLUDED.volume;

我收到并收到错误：

1 2	ERROR: ON CONFLICT DO UPDATE command cannot affect ROW a SECOND TIME HINT: Ensure that no ROWS proposed FOR insertion WITHIN the same command have duplicate constrained VALUES.

我不懂为什么？那里没有重复！但我的下一步将是创建一个请求，逐步添加(或更新)每一行(独立于重复项存在)。