feat(spanner): add support for float32 (#2020)

This PR contains support for FLOAT32 type on Cloud Spanner.

Author: alkatrivedi

.gitignore

@@ -12,3 +12,4 @@ system-test/*key.json
 .DS_Store
 package-lock.json
 __pycache__
+.vscode

src/codec.ts

@@ -118,6 +118,21 @@ abstract class WrappedNumber {
  abstract valueOf(): number;
 }
 
+/**
+ * @typedef Float32
+ * @see Spanner.float32
+ */
+export class Float32 extends WrappedNumber {
+ value: number;
+ constructor(value: number) {
+ super();
+ this.value = value;
+ }
+ valueOf(): number {
+ return Number(this.value);
+ }
+}
+
 /**
  * @typedef Float
  * @see Spanner.float
@@ -377,6 +392,10 @@ function decode(value: Value, type: spannerClient.spanner.v1.Type): Value {
  case 'BYTES':
  decoded = Buffer.from(decoded, 'base64');
  break;
+ case spannerClient.spanner.v1.TypeCode.FLOAT32:
+ case 'FLOAT32':
+ decoded = new Float32(decoded);
+ break;
  case spannerClient.spanner.v1.TypeCode.FLOAT64:
  case 'FLOAT64':
  decoded = new Float(decoded);
@@ -531,6 +550,7 @@ const TypeCode: {
  bool: 'BOOL',
  int64: 'INT64',
  pgOid: 'INT64',
+ float32: 'FLOAT32',
  float64: 'FLOAT64',
  numeric: 'NUMERIC',
  pgNumeric: 'NUMERIC',
@@ -567,6 +587,7 @@ interface FieldType extends Type {
 /**
  * @typedef {object} ParamType
  * @property {string} type The param type. Must be one of the following:
+ * - float32
  * - float64
  * - int64
  * - numeric
@@ -601,6 +622,10 @@ function getType(value: Value): Type {
  const isSpecialNumber =
  is.infinite(value) || (is.number(value) && isNaN(value));
 
+ if (value instanceof Float32) {
+ return {type: 'float32'};
+ }
+
  if (is.decimal(value) || isSpecialNumber || value instanceof Float) {
  return {type: 'float64'};
  }
@@ -780,6 +805,7 @@ export const codec = {
  convertProtoTimestampToDate,
  createTypeObject,
  SpannerDate,
+ Float32,
  Float,
  Int,
  Numeric,

src/index.ts

@@ -26,6 +26,7 @@ import * as streamEvents from 'stream-events';
 import * as through from 'through2';
 import {
  codec,
+ Float32,
  Float,
  Int,
  Numeric,
@@ -1671,6 +1672,22 @@ class Spanner extends GrpcService {
  return new PreciseDate(value as number);
  }
 
+ /**
+ * Helper function to get a Cloud Spanner Float32 object.
+ *
+ * @param {string|number} value The float as a number or string.
+ * @returns {Float32}
+ *
+ * @example
+ * ```
+ * const {Spanner} = require('@google-cloud/spanner');
+ * const float = Spanner.float32(10);
+ * ```
+ */
+ static float32(value): Float32 {
+ return new codec.Float32(value);
+ }
+
  /**
  * Helper function to get a Cloud Spanner Float64 object.
  *
@@ -1786,6 +1803,7 @@ class Spanner extends GrpcService {
 promisifyAll(Spanner, {
  exclude: [
  'date',
+ 'float32',
  'float',
  'instance',
  'instanceConfig',
@@ -1946,4 +1964,4 @@ import * as protos from '../protos/protos';
 import IInstanceConfig = instanceAdmin.spanner.admin.instance.v1.IInstanceConfig;
 export {v1, protos};
 export default {Spanner};
-export {Float, Int, Struct, Numeric, PGNumeric, SpannerDate};
+export {Float32, Float, Int, Struct, Numeric, PGNumeric, SpannerDate};