You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: vec_to_datum_tmpl.go
    path of file: ./repos/cockroach/pkg/sql/colconv
    
    the code of the file until where you have to start completion: // Copyright 2020 The Cockroach Authors.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.

// {{/*
//go:build execgen_template
// +build execgen_template

//
// This file is the execgen template for vec_to_datum.eg.go. It's formatted
// in a special way, so it's both valid Go and a valid text/template input.
// This permits editing this file with editor support.
//
// */}}

package colconv

import (
	"sync"

	"github.com/cockroachdb/cockroach/pkg/col/coldata"
	"github.com/cockroachdb/cockroach/pkg/col/typeconv"
	"github.com/cockroachdb/cockroach/pkg/sql/colexecerror"
	"github.com/coc
    
func (c *VecToDatumConverter) ConvertVecs(vecs []coldata.Vec, inputLen int, sel []int) {
	if len(c.vecIdxsToConvert) == 0 || inputLen == 0 {
		// No vectors were selected for conversion or there are no tuples to
		// convert, so there is nothing to do.
		return
	}
	// Ensure that convertedVecs are of sufficient length.
	requiredLength := inputLen
	if sel != nil {
		// When sel is non-nil, it might be something like sel = [1023], so we
		// need to allocate up to the largest index mentioned in sel. Here, we
		// rely on the fact that selection vectors are increasing sequences.
		requiredLength = sel[inputLen-1] + 1
	}
	for _, vecIdx := range c.vecIdxsToConvert {
		if cap(c.convertedVecs[vecIdx]) < requiredLength {
			c.convertedVecs[vecIdx] = make([]tree.Datum, requiredLength)
		} else {
			c.convertedVecs[vecIdx] = c.convertedVecs[vecIdx][:requiredLength]
		}
	}
	if c.da.AllocSize < requiredLength {
		// Adjust the datum alloc according to the length of the batch since
		// this batch is the longest we've seen so far.
		c.da.AllocSize = requiredLength
	}
	for _, vecIdx := range c.vecIdxsToConvert {
		ColVecToDatum(
			c.convertedVecs[vecIdx], vecs[vecIdx], inputLen, sel, &c.da,
		)
	}
}