fix: (enhance) BOM Operations Report

- Added filters in the Report for BOM ID, Item Code and Workstation
- Converted Raw SQL to frappe.qb and added method to get filtered data
- Changed fieldtype of 'Time in mins' from Int to Float
- Get BOM wise grouped data to  keep order and accurate grouping in report
diff --git a/erpnext/manufacturing/report/bom_operations_time/bom_operations_time.js b/erpnext/manufacturing/report/bom_operations_time/bom_operations_time.js
index 7468e34..705da5a 100644
--- a/erpnext/manufacturing/report/bom_operations_time/bom_operations_time.js
+++ b/erpnext/manufacturing/report/bom_operations_time/bom_operations_time.js
@@ -4,6 +4,39 @@
 
 frappe.query_reports["BOM Operations Time"] = {
 	"filters": [
-
+		{
+			"fieldname": "item_code",
+			"label": __("Item Code"),
+			"fieldtype": "Link",
+			"width": "100",
+			"options": "Item",
+			"get_query": () =>{
+				return {
+					filters: { "disabled": 0, "is_stock_item": 1 }
+				}
+			}
+		},
+		{
+			"fieldname": "bom_id",
+			"label": __("BOM ID"),
+			"fieldtype": "MultiSelectList",
+			"width": "80",
+			"options": "BOM",
+			"get_data": function(txt) {
+				return frappe.db.get_link_options("BOM", txt);
+			},
+			"get_query": () =>{
+				return {
+					filters: { "docstatus": 1, "is_active": 1 }
+				}
+			}
+		},
+		{
+			"fieldname": "workstation",
+			"label": __("Workstation"),
+			"fieldtype": "Link",
+			"width": "100",
+			"options": "Workstation"
+		},
 	]
 };
diff --git a/erpnext/manufacturing/report/bom_operations_time/bom_operations_time.py b/erpnext/manufacturing/report/bom_operations_time/bom_operations_time.py
index e7a818a..0bed46a 100644
--- a/erpnext/manufacturing/report/bom_operations_time/bom_operations_time.py
+++ b/erpnext/manufacturing/report/bom_operations_time/bom_operations_time.py
@@ -4,7 +4,8 @@
 
 import frappe
 from frappe import _
-
+from frappe.model.meta import get_field_precision
+from frappe.utils import flt
 
 def execute(filters=None):
 	data = get_data(filters)
@@ -12,19 +13,15 @@
 	return columns, data
 
 def get_data(filters):
-	data = []
+	bom_wise_data = {}
+	bom_data, report_data = [], []
 
-	bom_data = []
-	for d in frappe.db.sql("""
-		SELECT
-			bom.name, bom.item, bom.item_name, bom.uom,
-			bomps.operation, bomps.workstation, bomps.time_in_mins
-		FROM `tabBOM` bom, `tabBOM Operation` bomps
-		WHERE
-			bom.docstatus = 1 and bom.is_active = 1 and bom.name = bomps.parent
-		""", as_dict=1):
+	bom_operation_data = get_filtered_data(filters)
+
+	for d in bom_operation_data:
 		row = get_args()
 		if d.name not in bom_data:
+			bom_wise_data[d.name] = []
 			bom_data.append(d.name)
 			row.update(d)
 		else:
@@ -34,14 +31,49 @@
 				"time_in_mins": d.time_in_mins
 			})
 
-		data.append(row)
+		# maintain BOM wise data for grouping such as:
+		# {"BOM A": [{Row1}, {Row2}], "BOM B": ...}
+		bom_wise_data[d.name].append(row)
 
 	used_as_subassembly_items = get_bom_count(bom_data)
 
-	for d in data:
-		d.used_as_subassembly_items = used_as_subassembly_items.get(d.name, 0)
+	for d in bom_wise_data:
+		for row in bom_wise_data[d]:
+			row.used_as_subassembly_items = used_as_subassembly_items.get(row.name, 0)
+			report_data.append(row)
 
-	return data
+	return report_data
+
+def get_filtered_data(filters):
+	bom = frappe.qb.DocType("BOM")
+	bom_ops = frappe.qb.DocType("BOM Operation")
+
+	bom_ops_query = (
+		frappe.qb.from_(bom)
+		.join(bom_ops).on(bom.name == bom_ops.parent)
+		.select(
+			bom.name, bom.item, bom.item_name, bom.uom,
+			bom_ops.operation, bom_ops.workstation, bom_ops.time_in_mins
+		).where(
+			(bom.docstatus == 1)
+			& (bom.is_active == 1)
+		)
+	)
+
+	if filters.get("item_code"):
+		bom_ops_query = bom_ops_query.where(bom.item == filters.get("item_code"))
+
+	if filters.get("bom_id"):
+		bom_ops_query = bom_ops_query.where(bom.name.isin(filters.get("bom_id")))
+
+	if filters.get("workstation"):
+		bom_ops_query = bom_ops_query.where(
+			bom_ops.workstation == filters.get("workstation")
+		)
+
+	bom_operation_data = bom_ops_query.run(as_dict=True)
+
+	return bom_operation_data
 
 def get_bom_count(bom_data):
 	data = frappe.get_all("BOM Item",
@@ -68,13 +100,13 @@
 		"options": "BOM",
 		"fieldname": "name",
 		"fieldtype": "Link",
-		"width": 140
+		"width": 220
 	}, {
-		"label": _("BOM Item Code"),
+		"label": _("Item Code"),
 		"options": "Item",
 		"fieldname": "item",
 		"fieldtype": "Link",
-		"width": 140
+		"width": 150
 	}, {
 		"label": _("Item Name"),
 		"fieldname": "item_name",
@@ -85,13 +117,13 @@
 		"options": "UOM",
 		"fieldname": "uom",
 		"fieldtype": "Link",
-		"width": 140
+		"width": 100
 	}, {
 		"label": _("Operation"),
 		"options": "Operation",
 		"fieldname": "operation",
 		"fieldtype": "Link",
-		"width": 120
+		"width": 140
 	}, {
 		"label": _("Workstation"),
 		"options": "Workstation",
@@ -101,11 +133,11 @@
 	}, {
 		"label": _("Time (In Mins)"),
 		"fieldname": "time_in_mins",
-		"fieldtype": "Int",
-		"width": 140
+		"fieldtype": "Float",
+		"width": 120
 	}, {
 		"label": _("Sub-assembly BOM Count"),
 		"fieldname": "used_as_subassembly_items",
 		"fieldtype": "Int",
-		"width": 180
+		"width": 200
 	}]