Expressions: Sql expressions with Duckdb (#81666)

duckdb temp storage of dataframes using parquet and querying from sql expressions
---------

Co-authored-by: Ryan McKinley <ryantxu@gmail.com>

pkg/expr/sql/parser_test.go

@@ -0,0 +1,58 @@
+package sql
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestParse(t *testing.T) {
+	sql := "select * from foo"
+	tables, err := parseTables((sql))
+	assert.Nil(t, err)
+
+	assert.Equal(t, "FOO", tables[0])
+}
+
+func TestParseWithComma(t *testing.T) {
+	sql := "select * from foo,bar"
+	tables, err := parseTables((sql))
+	assert.Nil(t, err)
+
+	assert.Equal(t, "FOO", tables[0])
+	assert.Equal(t, "BAR", tables[1])
+}
+
+func TestParseWithCommas(t *testing.T) {
+	sql := "select * from foo,bar,baz"
+	tables, err := parseTables((sql))
+	assert.Nil(t, err)
+
+	assert.Equal(t, "FOO", tables[0])
+	assert.Equal(t, "BAR", tables[1])
+	assert.Equal(t, "BAZ", tables[2])
+}
+
+func TestArray(t *testing.T) {
+	sql := "SELECT array_value(1, 2, 3)"
+	tables, err := TablesList((sql))
+	assert.Nil(t, err)
+
+	assert.Equal(t, 0, len(tables))
+}
+
+func TestArray2(t *testing.T) {
+	sql := "SELECT array_value(1, 2, 3)[2]"
+	tables, err := TablesList((sql))
+	assert.Nil(t, err)
+
+	assert.Equal(t, 0, len(tables))
+}
+
+func TestXxx(t *testing.T) {
+	sql := "SELECT [3, 2, 1]::INT[3];"
+	tables, err := TablesList((sql))
+	assert.Nil(t, err)
+
+	assert.Equal(t, 0, len(tables))
+}