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perf: cache parsers per column #3568

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perf: cache parsers per column #3568

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9 changes: 6 additions & 3 deletions packages/pg-native/lib/build-result.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ class Result {
this.fields = []
this.rows = []
this._prebuiltEmptyResultObject = null
this._parsers = []
}

consumeCommand(pq) {
Expand All @@ -21,13 +22,16 @@ class Result {
const nfields = pq.nfields()
this.fields = new Array(nfields)
const row = {}
this._parsers = new Array(nfields)
for (let x = 0; x < nfields; x++) {
const name = pq.fname(x)
row[name] = null
const typeId = pq.ftype(x)
this.fields[x] = {
name: name,
dataTypeID: pq.ftype(x),
dataTypeID: typeId,
}
this._parsers[x] = this._types.getTypeParser(typeId)
}
this._prebuiltEmptyResultObject = { ...row }
}
Expand Down Expand Up @@ -61,8 +65,7 @@ class Result {
if (rawValue === '' && pq.getisnull(rowIndex, colIndex)) {
return null
}
const dataTypeId = this.fields[colIndex].dataTypeID
return this._types.getTypeParser(dataTypeId)(rawValue)
return this._parsers[colIndex](rawValue)
}
}

Expand Down