def to_sql(self, schema, not_null=False, boolean=False):
lhs = SQLang[self.lhs].partial_eval()
rhs = SQLang[self.rhs].partial_eval()
lhs_sql = lhs.to_sql(schema, not_null=True)
rhs_sql = rhs.to_sql(schema, not_null=True)
if is_literal(rhs) and lhs_sql[0].sql.b != None and rhs.value in ("T",
"F"):
rhs_sql = BooleanOp(rhs).to_sql(schema)
if is_literal(lhs) and rhs_sql[0].sql.b != None and lhs.value in ("T",
"F"):
lhs_sql = BooleanOp(lhs).to_sql(schema)
if len(lhs_sql) != len(rhs_sql):
Log.error("lhs and rhs have different dimensionality!?")
acc = []
for l, r in zip(lhs_sql, rhs_sql):
for t in "bsnj":
if r.sql[t] == None:
if l.sql[t] == None:
pass
else:
acc.append(ConcatSQL(l.sql[t], SQL_IS_NULL))
elif l.sql[t] == None:
acc.append(ConcatSQL(r.sql[t], SQL_IS_NULL))
else:
acc.append(
ConcatSQL(sql_iso(l.sql[t]), SQL_EQ,
sql_iso(r.sql[t])))
if not acc:
return FALSE.to_sql(schema)
else:
return wrap([{"name": ".", "sql": {"b": JoinSQL(SQL_OR, acc)}}])
def to_sql(self, schema, not_null=False, boolean=False):
not_expr = NotOp(BooleanOp(self.term)).partial_eval()
if is_op(not_expr, NotOp):
return wrap([{
"name": ".",
"sql": {
"b":
"NOT " + sql_iso(not_expr.term.to_sql(schema)[0].sql.b)
},
}])
else:
return not_expr.to_sql(schema)
def _set_op(self, query):
# GET LIST OF SELECTED COLUMNS
vars_ = UNION([
v.var for select in listwrap(query.select)
for v in select.value.vars()
])
schema = self.schema
known_vars = schema.keys()
active_columns = {".": set()}
for v in vars_:
for c in schema.leaves(v):
nest = c.nested_path[0]
active_columns.setdefault(nest, set()).add(c)
# ANY VARS MENTIONED WITH NO COLUMNS?
for v in vars_:
if not any(startswith_field(cname, v) for cname in known_vars):
active_columns["."].add(
Column(name=v,
jx_type=IS_NULL,
es_column=".",
es_index=".",
es_type='NULL',
nested_path=["."],
last_updated=Date.now()))
# EVERY COLUMN, AND THE INDEX IT TAKES UP
index_to_column = {} # MAP FROM INDEX TO COLUMN (OR SELECT CLAUSE)
index_to_uid = {} # FROM NESTED PATH TO THE INDEX OF UID
sql_selects = [
] # EVERY SELECT CLAUSE (NOT TO BE USED ON ALL TABLES, OF COURSE)
nest_to_alias = {
nested_path[0]: "__" + unichr(ord('a') + i) + "__"
for i, nested_path in enumerate(self.snowflake.query_paths)
}
sorts = []
if query.sort:
for select in query.sort:
col = SQLang[select.value].to_sql(schema)[0]
for t, sql in col.sql.items():
json_type = sql_type_to_json_type[t]
if json_type in STRUCT:
continue
column_number = len(sql_selects)
# SQL HAS ABS TABLE REFERENCE
column_alias = _make_column_name(column_number)
sql_selects.append(sql_alias(sql, column_alias))
if select.sort == -1:
sorts.append(quote_column(column_alias) + SQL_IS_NULL)
sorts.append(quote_column(column_alias) + " DESC")
else:
sorts.append(quote_column(column_alias) + SQL_IS_NULL)
sorts.append(quote_column(column_alias))
primary_doc_details = Data()
# EVERY SELECT STATEMENT THAT WILL BE REQUIRED, NO MATTER THE DEPTH
# WE WILL CREATE THEM ACCORDING TO THE DEPTH REQUIRED
nested_path = []
for step, sub_table in self.snowflake.tables:
nested_path.insert(0, step)
nested_doc_details = {
"sub_table": sub_table,
"children": [],
"index_to_column": {},
"nested_path": nested_path
}
# INSERT INTO TREE
if not primary_doc_details:
primary_doc_details = nested_doc_details
else:
def place(parent_doc_details):
if startswith_field(step,
parent_doc_details['nested_path'][0]):
for c in parent_doc_details['children']:
if place(c):
return True
parent_doc_details['children'].append(
nested_doc_details)
place(primary_doc_details)
alias = nested_doc_details['alias'] = nest_to_alias[step]
# WE ALWAYS ADD THE UID
column_number = index_to_uid[step] = nested_doc_details[
'id_coord'] = len(sql_selects)
sql_select = quote_column(alias, UID)
sql_selects.append(
sql_alias(sql_select, _make_column_name(column_number)))
if step != ".":
# ID AND ORDER FOR CHILD TABLES
index_to_column[column_number] = ColumnMapping(
sql=sql_select,
type="number",
nested_path=nested_path,
column_alias=_make_column_name(column_number))
column_number = len(sql_selects)
sql_select = quote_column(alias, ORDER)
sql_selects.append(
sql_alias(sql_select, _make_column_name(column_number)))
index_to_column[column_number] = ColumnMapping(
sql=sql_select,
type="number",
nested_path=nested_path,
column_alias=_make_column_name(column_number))
# WE DO NOT NEED DATA FROM TABLES WE REQUEST NOTHING FROM
if step not in active_columns:
continue
# ADD SQL SELECT COLUMNS FOR EACH jx SELECT CLAUSE
si = 0
for select in listwrap(query.select):
try:
column_number = len(sql_selects)
select.pull = get_column(column_number)
db_columns = SQLang[select.value].partial_eval().to_sql(
schema)
for column in db_columns:
for t, unsorted_sql in column.sql.items():
json_type = sql_type_to_json_type[t]
if json_type in STRUCT:
continue
column_number = len(sql_selects)
column_alias = _make_column_name(column_number)
sql_selects.append(
sql_alias(unsorted_sql, column_alias))
if startswith_field(schema.path, step) and is_op(
select.value, LeavesOp):
# ONLY FLATTEN primary_nested_path AND PARENTS, NOT CHILDREN
index_to_column[
column_number] = nested_doc_details[
'index_to_column'][
column_number] = ColumnMapping(
push_name=literal_field(
get_property_name(
concat_field(
select.name,
column.name))),
push_child=".",
push_column_name=
get_property_name(
concat_field(
select.name,
column.name)),
push_column=si,
pull=get_column(column_number),
sql=unsorted_sql,
type=json_type,
column_alias=column_alias,
nested_path=nested_path)
si += 1
else:
index_to_column[
column_number] = nested_doc_details[
'index_to_column'][
column_number] = ColumnMapping(
push_name=select.name,
push_child=column.name,
push_column_name=select.name,
push_column=si,
pull=get_column(column_number),
sql=unsorted_sql,
type=json_type,
column_alias=column_alias,
nested_path=nested_path)
finally:
si += 1
where_clause = BooleanOp(query.where).partial_eval().to_sql(
schema, boolean=True)[0].sql.b
unsorted_sql = self._make_sql_for_one_nest_in_set_op(
".", sql_selects, where_clause, active_columns, index_to_column)
for n, _ in self.snowflake.tables:
sorts.append(quote_column(COLUMN + text(index_to_uid[n])))
ordered_sql = ConcatSQL(SQL_SELECT, SQL_STAR, SQL_FROM,
sql_iso(unsorted_sql), SQL_ORDERBY,
sql_list(sorts), SQL_LIMIT,
quote_value(query.limit))
result = self.db.query(ordered_sql)
def _accumulate_nested(rows, row, nested_doc_details, parent_doc_id,
parent_id_coord):
"""
:param rows: REVERSED STACK OF ROWS (WITH push() AND pop())
:param row: CURRENT ROW BEING EXTRACTED
:param nested_doc_details: {
"nested_path": wrap_nested_path(nested_path),
"index_to_column": map from column number to column details
"children": all possible direct decedents' nested_doc_details
}
:param parent_doc_id: the id of the parent doc (for detecting when to step out of loop)
:param parent_id_coord: the column number for the parent id (so we ca extract from each row)
:return: the nested property (usually an array)
"""
previous_doc_id = None
doc = Null
output = []
id_coord = nested_doc_details['id_coord']
while True:
doc_id = row[id_coord]
if doc_id == None or (parent_id_coord is not None and
row[parent_id_coord] != parent_doc_id):
rows.append(
row
) # UNDO PREVIOUS POP (RECORD IS NOT A NESTED RECORD OF parent_doc)
return output
if doc_id != previous_doc_id:
previous_doc_id = doc_id
doc = Null
curr_nested_path = nested_doc_details['nested_path'][0]
index_to_column = nested_doc_details[
'index_to_column'].items()
for i, c in index_to_column:
value = row[i]
if is_list(query.select) or is_op(
query.select.value, LeavesOp):
# ASSIGN INNER PROPERTIES
relative_field = concat_field(
c.push_name, c.push_child)
else: # FACT IS EXPECTED TO BE A SINGLE VALUE, NOT AN OBJECT
relative_field = c.push_child
if relative_field == ".":
if exists(value):
doc = value
elif exists(value):
if doc is Null:
doc = Data()
doc[relative_field] = value
for child_details in nested_doc_details['children']:
# EACH NESTED TABLE MUST BE ASSEMBLED INTO A LIST OF OBJECTS
child_id = row[child_details['id_coord']]
if child_id is not None:
nested_value = _accumulate_nested(
rows, row, child_details, doc_id, id_coord)
if nested_value != None:
push_name = child_details['nested_path'][0]
if is_list(query.select) or is_op(
query.select.value, LeavesOp):
# ASSIGN INNER PROPERTIES
relative_field = relative_field(
push_name, curr_nested_path)
else: # FACT IS EXPECTED TO BE A SINGLE VALUE, NOT AN OBJECT
relative_field = "."
if relative_field == ".":
doc = unwraplist(nested_value)
else:
doc[relative_field] = unwraplist(nested_value)
output.append(doc)
try:
row = rows.pop()
except IndexError:
return output
cols = tuple(
[i for i in index_to_column.values() if i.push_name != None])
rows = list(reversed(unwrap(result.data)))
if rows:
row = rows.pop()
data = _accumulate_nested(rows, row, primary_doc_details, None,
None)
else:
data = result.data
if query.format == "cube":
# for f, full_name in self.snowflake.tables:
# if f != '.' or (test_dots(cols) and is_list(query.select)):
# num_rows = len(result.data)
# num_cols = MAX([c.push_column for c in cols]) + 1 if len(cols) else 0
# map_index_to_name = {c.push_column: c.push_column_name for c in cols}
# temp_data = [[None] * num_rows for _ in range(num_cols)]
# for rownum, d in enumerate(result.data):
# for c in cols:
# if c.push_child == ".":
# temp_data[c.push_column][rownum] = c.pull(d)
# else:
# column = temp_data[c.push_column][rownum]
# if column is None:
# column = temp_data[c.push_column][rownum] = {}
# column[c.push_child] = c.pull(d)
# output = Data(
# meta={"format": "cube"},
# data={n: temp_data[c] for c, n in map_index_to_name.items()},
# edges=[{
# "name": "rownum",
# "domain": {
# "type": "rownum",
# "min": 0,
# "max": num_rows,
# "interval": 1
# }
# }]
# )
# return output
if is_list(query.select) or is_op(query.select.value, LeavesOp):
num_rows = len(data)
temp_data = {
c.push_column_name: [None] * num_rows
for c in cols
}
for rownum, d in enumerate(data):
for c in cols:
temp_data[c.push_column_name][rownum] = d[c.push_name]
return Data(meta={"format": "cube"},
data=temp_data,
edges=[{
"name": "rownum",
"domain": {
"type": "rownum",
"min": 0,
"max": num_rows,
"interval": 1
}
}])
else:
num_rows = len(data)
map_index_to_name = {
c.push_column: c.push_column_name
for c in cols
}
temp_data = [data]
return Data(meta={"format": "cube"},
data={
n: temp_data[c]
for c, n in map_index_to_name.items()
},
edges=[{
"name": "rownum",
"domain": {
"type": "rownum",
"min": 0,
"max": num_rows,
"interval": 1
}
}])
elif query.format == "table":
# for f, _ in self.snowflake.tables:
# if frum.endswith(f):
# num_column = MAX([c.push_column for c in cols]) + 1
# header = [None] * num_column
# for c in cols:
# header[c.push_column] = c.push_column_name
#
# output_data = []
# for d in result.data:
# row = [None] * num_column
# for c in cols:
# set_column(row, c.push_column, c.push_child, c.pull(d))
# output_data.append(row)
#
# return Data(
# meta={"format": "table"},
# header=header,
# data=output_data
# )
if is_list(query.select) or is_op(query.select.value, LeavesOp):
column_names = [None] * (max(c.push_column for c in cols) + 1)
for c in cols:
column_names[c.push_column] = c.push_column_name
temp_data = []
for rownum, d in enumerate(data):
row = [None] * len(column_names)
for c in cols:
row[c.push_column] = d[c.push_name]
temp_data.append(row)
return Data(meta={"format": "table"},
header=column_names,
data=temp_data)
else:
column_names = listwrap(query.select).name
return Data(meta={"format": "table"},
header=column_names,
data=[[d] for d in data])
else:
# for f, _ in self.snowflake.tables:
# if frum.endswith(f) or (test_dots(cols) and is_list(query.select)):
# data = []
# for d in result.data:
# row = Data()
# for c in cols:
# if c.push_child == ".":
# row[c.push_name] = c.pull(d)
# elif c.num_push_columns:
# tuple_value = row[c.push_name]
# if not tuple_value:
# tuple_value = row[c.push_name] = [None] * c.num_push_columns
# tuple_value[c.push_child] = c.pull(d)
# else:
# row[c.push_name][c.push_child] = c.pull(d)
#
# data.append(row)
#
# return Data(
# meta={"format": "list"},
# data=data
# )
if is_list(query.select) or is_op(query.select.value, LeavesOp):
temp_data = []
for rownum, d in enumerate(data):
row = {}
for c in cols:
row[c.push_column_name] = d[c.push_name]
temp_data.append(row)
return Data(meta={"format": "list"}, data=temp_data)
else:
return Data(meta={"format": "list"}, data=data)