frontend/node_modules/apache-arrow/visitor/bytewidth.mjs

/* istanbul ignore file */
import { Visitor } from '../visitor';
import { TimeUnit } from '../enum';
/** @ignore */ const sum = (x, y) => x + y;
/** @ignore */ const variableWidthColumnErrorMessage = (type) => `Cannot compute the byte width of variable-width column ${type}`;
/** @ignore */
export class ByteWidthVisitor extends Visitor {
    visitNull(____) { return 0; }
    visitInt(type) { return type.bitWidth / 8; }
    visitFloat(type) { return type.ArrayType.BYTES_PER_ELEMENT; }
    visitBinary(type) { throw new Error(variableWidthColumnErrorMessage(type)); }
    visitUtf8(type) { throw new Error(variableWidthColumnErrorMessage(type)); }
    visitBool(____) { return 1 / 8; }
    visitDecimal(____) { return 16; }
    visitDate(type) { return (type.unit + 1) * 4; }
    visitTime(type) { return type.bitWidth / 8; }
    visitTimestamp(type) { return type.unit === TimeUnit.SECOND ? 4 : 8; }
    visitInterval(type) { return (type.unit + 1) * 4; }
    visitList(type) { throw new Error(variableWidthColumnErrorMessage(type)); }
    visitStruct(type) { return this.visitFields(type.children).reduce(sum, 0); }
    visitUnion(type) { return this.visitFields(type.children).reduce(sum, 0); }
    visitFixedSizeBinary(type) { return type.byteWidth; }
    visitFixedSizeList(type) { return type.listSize * this.visitFields(type.children).reduce(sum, 0); }
    visitMap(type) { return this.visitFields(type.children).reduce(sum, 0); }
    visitDictionary(type) { return this.visit(type.indices); }
    visitFields(fields) { return (fields || []).map((field) => this.visit(field.type)); }
    visitSchema(schema) { return this.visitFields(schema.fields).reduce(sum, 0); }
}
/** @ignore */
export const instance = new ByteWidthVisitor();

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