fix: BigQueryTimestamp should keep accepting floats (#1339)

Author: alvarowolfx

src/bigquery.ts

@@ -640,7 +640,8 @@ export class BigQuery extends Service {
           break;
         }
         case 'TIMESTAMP': {
-          value = BigQuery.timestamp(value);
+          const pd = new PreciseDate(BigInt(value) * BigInt(1000));
+          value = BigQuery.timestamp(pd);
           break;
         }
         case 'GEOGRAPHY': {
@@ -881,6 +882,10 @@ export class BigQuery extends Service {
    * A timestamp represents an absolute point in time, independent of any time
    * zone or convention such as Daylight Savings Time.
    *
+   * The recommended input here is a `Date` or `PreciseDate` class.
+   * If passing as a `string`, it should be Timestamp literals: https://cloud.google.com/bigquery/docs/reference/standard-sql/lexical#timestamp_literals.
+   * When passing a `number` input, it should be epoch seconds in float representation.
+   *
    * @method BigQuery.timestamp
    * @param {Date|string} value The time.
    *
@@ -890,12 +895,19 @@ export class BigQuery extends Service {
    * const timestamp = BigQuery.timestamp(new Date());
    * ```
    */
+  static timestamp(value: Date | PreciseDate | string | number) {
+    return new BigQueryTimestamp(value);
+  }
 
   /**
    * A timestamp represents an absolute point in time, independent of any time
    * zone or convention such as Daylight Savings Time.
    *
-   * @param {Date|string} value The time.
+   * The recommended input here is a `Date` or `PreciseDate` class.
+   * If passing as a `string`, it should be Timestamp literals: https://cloud.google.com/bigquery/docs/reference/standard-sql/lexical#timestamp_literals.
+   * When passing a `number` input, it should be epoch seconds in float representation.
+   *
+   * @param {Date|string|string|number} value The time.
    *
    * @example
    * ```
@@ -904,10 +916,6 @@ export class BigQuery extends Service {
    * const timestamp = bigquery.timestamp(new Date());
    * ```
    */
-  static timestamp(value: Date | PreciseDate | string | number) {
-    return new BigQueryTimestamp(value);
-  }
-
   timestamp(value: Date | PreciseDate | string | number) {
     return BigQuery.timestamp(value);
   }
@@ -2204,6 +2212,11 @@ export class Geography {
 
 /**
  * Timestamp class for BigQuery.
+ *
+ * The recommended input here is a `Date` or `PreciseDate` class.
+ * If passing as a `string`, it should be Timestamp literals: https://cloud.google.com/bigquery/docs/reference/standard-sql/lexical#timestamp_literals.
+ * When passing a `number` input, it should be epoch seconds in float representation.
+ *
  */
 export class BigQueryTimestamp {
   value: string;
@@ -2217,13 +2230,15 @@ export class BigQueryTimestamp {
       if (/^\d{4}-\d{1,2}-\d{1,2}/.test(value)) {
         pd = new PreciseDate(value);
       } else {
-        pd = new PreciseDate(BigInt(value) * BigInt(1000));
+        const floatValue = Number.parseFloat(value);
+        if (!Number.isNaN(floatValue)) {
+          pd = this.fromFloatValue_(floatValue);
+        } else {
+          pd = new PreciseDate(value);
+        }
       }
-    } else if (value) {
-      pd = new PreciseDate(BigInt(value) * BigInt(1000));
     } else {
-      // Nan or 0 - invalid dates
-      pd = new PreciseDate(value);
+      pd = this.fromFloatValue_(value);
     }
     // to keep backward compatibility, only converts with microsecond
     // precision if needed.
@@ -2233,6 +2248,15 @@ export class BigQueryTimestamp {
       this.value = new Date(pd.getTime()).toJSON();
     }
   }
+
+  fromFloatValue_(value: number): PreciseDate {
+    const secs = Math.trunc(value);
+    // Timestamps in BigQuery have microsecond precision, so we must
+    // return a round number of microseconds.
+    const micros = Math.trunc((value - secs) * 1e6 + 0.5);
+    const pd = new PreciseDate([secs, micros * 1000]);
+    return pd;
+  }
 }
 
 /**

test/bigquery.ts

@@ -471,7 +471,7 @@ describe('BigQuery', () => {
             f: [
               {v: '3'},
               {v: 'Milo'},
-              {v: now.valueOf() * 1000},
+              {v: now.valueOf() * 1000}, // int64 microseconds
               {v: 'false'},
               {v: 'true'},
               {v: '5.222330009847'},
@@ -523,7 +523,7 @@ describe('BigQuery', () => {
             id: 3,
             name: 'Milo',
             dob: {
-              input: now.valueOf() * 1000,
+              input: new PreciseDate(BigInt(now.valueOf()) * BigInt(1_000_000)),
               type: 'fakeTimestamp',
             },
             has_claws: false,
@@ -850,10 +850,8 @@ describe('BigQuery', () => {
   describe('timestamp', () => {
     const INPUT_STRING = '2016-12-06T12:00:00.000Z';
     const INPUT_STRING_MICROS = '2016-12-06T12:00:00.123456Z';
-    const INPUT_STRING_NEGATIVE = '1969-12-25T00:00:00.000Z';
     const INPUT_DATE = new Date(INPUT_STRING);
     const INPUT_PRECISE_DATE = new PreciseDate(INPUT_STRING_MICROS);
-    const INPUT_PRECISE_NEGATIVE_DATE = new PreciseDate(INPUT_STRING_NEGATIVE);
     const EXPECTED_VALUE = INPUT_DATE.toJSON();
     const EXPECTED_VALUE_MICROS = INPUT_PRECISE_DATE.toISOString();
 
@@ -883,31 +881,21 @@ describe('BigQuery', () => {
       assert.strictEqual(timestamp.value, EXPECTED_VALUE);
     });
 
-    it('should accept a number in microseconds', () => {
-      let ms = INPUT_PRECISE_DATE.valueOf(); // milliseconds
-      let us = ms * 1000 + INPUT_PRECISE_DATE.getMicroseconds(); // microseconds
-      let timestamp = bq.timestamp(us);
-      assert.strictEqual(timestamp.value, EXPECTED_VALUE_MICROS);
-
-      let usStr = `${us}`;
-      timestamp = bq.timestamp(usStr);
-      assert.strictEqual(timestamp.value, EXPECTED_VALUE_MICROS);
-
-      ms = INPUT_PRECISE_NEGATIVE_DATE.valueOf();
-      us = ms * 1000;
-      timestamp = bq.timestamp(us);
-      assert.strictEqual(timestamp.value, INPUT_STRING_NEGATIVE);
-
-      usStr = `${us}`;
-      timestamp = bq.timestamp(usStr);
-      assert.strictEqual(timestamp.value, INPUT_STRING_NEGATIVE);
-    });
-
     it('should accept a string with microseconds', () => {
       const timestamp = bq.timestamp(INPUT_STRING_MICROS);
       assert.strictEqual(timestamp.value, EXPECTED_VALUE_MICROS);
     });
 
+    it('should accept a float number', () => {
+      const d = new Date();
+      const f = d.valueOf() / 1000; // float seconds
+      let timestamp = bq.timestamp(f);
+      assert.strictEqual(timestamp.value, d.toJSON());
+
+      timestamp = bq.timestamp(f.toString());
+      assert.strictEqual(timestamp.value, d.toJSON());
+    });
+
     it('should accept a Date object', () => {
       const timestamp = bq.timestamp(INPUT_DATE);
       assert.strictEqual(timestamp.value, EXPECTED_VALUE);