clickhouse: type inference via the xqlc analysis core

go.mod

@@ -30,27 +30,36 @@ require (
 	google.golang.org/grpc v1.81.1
 	google.golang.org/protobuf v1.36.11
 	gopkg.in/yaml.v3 v3.0.1
+	modernc.org/sqlite v1.48.1
 )
 
 require (
 	cel.dev/expr v0.25.1 // indirect
 	filippo.io/edwards25519 v1.2.0 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/google/uuid v1.6.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/kr/text v0.2.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/ncruces/go-sqlite3-wasm/v2 v2.6.35302 // indirect
+	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/ncruces/julianday v1.0.0 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/rogpeppe/go-internal v1.10.0 // indirect
 	github.com/wasilibs/wazero-helpers v0.0.0-20240620070341-3dff1577cd52 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
-	golang.org/x/exp v0.0.0-20250620022241-b7579e27df2b // indirect
+	golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 // indirect
 	golang.org/x/net v0.55.0 // indirect
 	golang.org/x/sys v0.45.0 // indirect
 	golang.org/x/text v0.37.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20260226221140-a57be14db171 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171 // indirect
+	modernc.org/libc v1.70.0 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
 )

go.sum

@@ -13,6 +13,8 @@ github.com/cubicdaiya/gonp v1.0.4/go.mod h1:iWGuP/7+JVTn02OWhRemVbMmG1DOUnmrGTYY
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/fatih/structtag v1.2.0 h1:/OdNE99OxoI/PqaW/SuSK9uxxT3f/tcSZgon/ssNSx4=
 github.com/fatih/structtag v1.2.0/go.mod h1:mBJUNpUnHmRKrKlQQlmCrh5PuhftFbNv8Ys4/aAZl94=
 github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
@@ -27,8 +29,12 @@ github.com/google/cel-go v0.28.1 h1:YWIwi77J4xIsYUwAF/iIuS6haffzIHS8yWI8glSbLWM=
 github.com/google/cel-go v0.28.1/go.mod h1:X0bD6iVNR8pkROSOoHVdgTkzmRcosof7WQqCD6wcMc8=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
+github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e h1:ijClszYn+mADRFY17kjQEVQ1XRhq2/JR1M3sGqeJoxs=
+github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e/go.mod h1:boTsfXsheKC2y+lKOCMpSfarhxDeIzfZG1jqGcPl3cA=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
+github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
@@ -47,16 +53,22 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/lib/pq v1.12.3 h1:tTWxr2YLKwIvK90ZXEw8GP7UFHtcbTtty8zsI+YjrfQ=
 github.com/lib/pq v1.12.3/go.mod h1:/p+8NSbOcwzAEI7wiMXFlgydTwcgTr3OSKMsD2BitpA=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/ncruces/go-sqlite3 v0.34.4 h1:bp8jd1o2CMvjkrrp1lOtHDu1TdzExNWACt+piQeMwzg=
 github.com/ncruces/go-sqlite3 v0.34.4/go.mod h1:tOyhDWnzlrzflKIGw177imjuO4ZEbfOS1NJ67B1BanQ=
 github.com/ncruces/go-sqlite3-wasm/v2 v2.6.35302 h1:IZCiInPIp6OhOc1skMDGOBMwMQuE1TK+QqVe35vd/ro=
 github.com/ncruces/go-sqlite3-wasm/v2 v2.6.35302/go.mod h1:ELHF6yqC51E0DiitfabHXl/aKKouCihugbhNT5a+yEY=
+github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
+github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
 github.com/ncruces/julianday v1.0.0 h1:fH0OKwa7NWvniGQtxdJRxAgkBMolni2BjDHaWTxqt7M=
 github.com/ncruces/julianday v1.0.0/go.mod h1:Dusn2KvZrrovOMJuOt0TNXL6tB7U2E8kvza5fFc9G7g=
 github.com/pganalyze/pg_query_go/v6 v6.2.2 h1:O0L6zMC226R82RF3X5n0Ki6HjytDsoAzuzp4ATVAHNo=
 github.com/pganalyze/pg_query_go/v6 v6.2.2/go.mod h1:Cn6+j4870kJz3iYNsb0VsNG04vpSWgEvBwc590J4qD0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
+github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
 github.com/riza-io/grpc-go v0.2.0 h1:2HxQKFVE7VuYstcJ8zqpN84VnAoJ4dCL6YFhJewNcHQ=
 github.com/riza-io/grpc-go v0.2.0/go.mod h1:2bDvR9KkKC3KhtlSHfR3dAXjUMT86kg4UfWFyVGWqi8=
 github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
@@ -104,16 +116,21 @@ go.opentelemetry.io/otel/trace v1.43.0 h1:BkNrHpup+4k4w+ZZ86CZoHHEkohws8AY+WTX09
 go.opentelemetry.io/otel/trace v1.43.0/go.mod h1:/QJhyVBUUswCphDVxq+8mld+AvhXZLhe+8WVFxiFff0=
 go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
-golang.org/x/exp v0.0.0-20250620022241-b7579e27df2b h1:M2rDM6z3Fhozi9O7NWsxAkg/yqS/lQJ6PmkyIV3YP+o=
-golang.org/x/exp v0.0.0-20250620022241-b7579e27df2b/go.mod h1:3//PLf8L/X+8b4vuAfHzxeRUl04Adcb341+IGKfnqS8=
+golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 h1:mgKeJMpvi0yx/sU5GsxQ7p6s2wtOnGAHZWCHUM4KGzY=
+golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546/go.mod h1:j/pmGrbnkbPtQfxEe5D0VQhZC6qKbfKifgD0oM7sR70=
+golang.org/x/mod v0.35.0 h1:Ww1D637e6Pg+Zb2KrWfHQUnH2dQRLBQyAtpr/haaJeM=
+golang.org/x/mod v0.35.0/go.mod h1:+GwiRhIInF8wPm+4AoT6L0FA1QWAad3OMdTRx4tFYlU=
 golang.org/x/net v0.55.0 h1:bcvxaJn3e1U6InsFWt1JUq1aSjnRxLzT2rtD2KfkDF8=
 golang.org/x/net v0.55.0/go.mod h1:L5U2KuzuOe1lY7Z+aWVIKK6qEeJXnXV9yzGA+WCHJww=
 golang.org/x/sync v0.21.0 h1:HLII4xRRTtCRkxYp4HNFF0Js/Og6q2i++KXbg0gHCwM=
 golang.org/x/sync v0.21.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.45.0 h1:dO4czNzziLiiXplLQgBCEpCvXQ3dnkn0SdaZSYdQ+FY=
 golang.org/x/sys v0.45.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/text v0.37.0 h1:Cqjiwd9eSg8e0QAkyCaQTNHFIIzWtidPahFWR83rTrc=
 golang.org/x/text v0.37.0/go.mod h1:a5sjxXGs9hsn/AJVwuElvCAo9v8QYLzvavO5z2PiM38=
+golang.org/x/tools v0.45.0 h1:18qN3FAooORvApf5XjCXgsuayZOEtXf6JK18I3+ONa8=
+golang.org/x/tools v0.45.0/go.mod h1:LuUGqqaXcXMEFEruIVJVm5mgDD8vww/z/SR1gQ4uE/0=
 gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
 gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
 google.golang.org/genproto/googleapis/api v0.0.0-20260226221140-a57be14db171 h1:tu/dtnW1o3wfaxCOjSLn5IRX4YDcJrtlpzYkhHhGaC4=
@@ -130,3 +147,31 @@ gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EV
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+modernc.org/cc/v4 v4.27.1 h1:9W30zRlYrefrDV2JE2O8VDtJ1yPGownxciz5rrbQZis=
+modernc.org/cc/v4 v4.27.1/go.mod h1:uVtb5OGqUKpoLWhqwNQo/8LwvoiEBLvZXIQ/SmO6mL0=
+modernc.org/ccgo/v4 v4.32.0 h1:hjG66bI/kqIPX1b2yT6fr/jt+QedtP2fqojG2VrFuVw=
+modernc.org/ccgo/v4 v4.32.0/go.mod h1:6F08EBCx5uQc38kMGl+0Nm0oWczoo1c7cgpzEry7Uc0=
+modernc.org/fileutil v1.4.0 h1:j6ZzNTftVS054gi281TyLjHPp6CPHr2KCxEXjEbD6SM=
+modernc.org/fileutil v1.4.0/go.mod h1:EqdKFDxiByqxLk8ozOxObDSfcVOv/54xDs/DUHdvCUU=
+modernc.org/gc/v2 v2.6.5 h1:nyqdV8q46KvTpZlsw66kWqwXRHdjIlJOhG6kxiV/9xI=
+modernc.org/gc/v2 v2.6.5/go.mod h1:YgIahr1ypgfe7chRuJi2gD7DBQiKSLMPgBQe9oIiito=
+modernc.org/gc/v3 v3.1.2 h1:ZtDCnhonXSZexk/AYsegNRV1lJGgaNZJuKjJSWKyEqo=
+modernc.org/gc/v3 v3.1.2/go.mod h1:HFK/6AGESC7Ex+EZJhJ2Gni6cTaYpSMmU/cT9RmlfYY=
+modernc.org/goabi0 v0.2.0 h1:HvEowk7LxcPd0eq6mVOAEMai46V+i7Jrj13t4AzuNks=
+modernc.org/goabi0 v0.2.0/go.mod h1:CEFRnnJhKvWT1c1JTI3Avm+tgOWbkOu5oPA8eH8LnMI=
+modernc.org/libc v1.70.0 h1:U58NawXqXbgpZ/dcdS9kMshu08aiA6b7gusEusqzNkw=
+modernc.org/libc v1.70.0/go.mod h1:OVmxFGP1CI/Z4L3E0Q3Mf1PDE0BucwMkcXjjLntvHJo=
+modernc.org/mathutil v1.7.1 h1:GCZVGXdaN8gTqB1Mf/usp1Y/hSqgI2vAGGP4jZMCxOU=
+modernc.org/mathutil v1.7.1/go.mod h1:4p5IwJITfppl0G4sUEDtCr4DthTaT47/N3aT6MhfgJg=
+modernc.org/memory v1.11.0 h1:o4QC8aMQzmcwCK3t3Ux/ZHmwFPzE6hf2Y5LbkRs+hbI=
+modernc.org/memory v1.11.0/go.mod h1:/JP4VbVC+K5sU2wZi9bHoq2MAkCnrt2r98UGeSK7Mjw=
+modernc.org/opt v0.1.4 h1:2kNGMRiUjrp4LcaPuLY2PzUfqM/w9N23quVwhKt5Qm8=
+modernc.org/opt v0.1.4/go.mod h1:03fq9lsNfvkYSfxrfUhZCWPk1lm4cq4N+Bh//bEtgns=
+modernc.org/sortutil v1.2.1 h1:+xyoGf15mM3NMlPDnFqrteY07klSFxLElE2PVuWIJ7w=
+modernc.org/sortutil v1.2.1/go.mod h1:7ZI3a3REbai7gzCLcotuw9AC4VZVpYMjDzETGsSMqJE=
+modernc.org/sqlite v1.48.1 h1:S85iToyU6cgeojybE2XJlSbcsvcWkQ6qqNXJHtW5hWA=
+modernc.org/sqlite v1.48.1/go.mod h1:hWjRO6Tj/5Ik8ieqxQybiEOUXy0NJFNp2tpvVpKlvig=
+modernc.org/strutil v1.2.1 h1:UneZBkQA+DX2Rp35KcM69cSsNES9ly8mQWD71HKlOA0=
+modernc.org/strutil v1.2.1/go.mod h1:EHkiggD70koQxjVdSBM3JKM7k6L0FbGE5eymy9i3B9A=
+modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
+modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=

internal/cmd/shim.go

@@ -4,6 +4,7 @@ import (
 	"github.com/sqlc-dev/sqlc/internal/compiler"
 	"github.com/sqlc-dev/sqlc/internal/config"
 	"github.com/sqlc-dev/sqlc/internal/config/convert"
+	"github.com/sqlc-dev/sqlc/internal/core"
 	"github.com/sqlc-dev/sqlc/internal/info"
 	"github.com/sqlc-dev/sqlc/internal/plugin"
 	"github.com/sqlc-dev/sqlc/internal/sql/catalog"
@@ -224,10 +225,90 @@ func pluginQueryParam(p compiler.Parameter) *plugin.Parameter {
 }
 
 func codeGenRequest(r *compiler.Result, settings config.CombinedSettings) *plugin.GenerateRequest {
+	// Engines on the xqlc core (ClickHouse) project the codegen catalog
+	// from the core catalog rather than the in-memory sql/catalog, which is
+	// nil on that path.
+	var cat *plugin.Catalog
+	if r.CoreCatalog != nil {
+		cat = pluginCatalogFromCore(r.CoreCatalog)
+	} else {
+		cat = pluginCatalog(r.Catalog)
+	}
 	return &plugin.GenerateRequest{
 		Settings:    pluginSettings(r, settings),
-		Catalog:     pluginCatalog(r.Catalog),
+		Catalog:     cat,
 		Queries:     pluginQueries(r),
 		SqlcVersion: info.Version,
 	}
 }
+
+// pluginCatalogFromCore projects a core.Catalog (the xqlc SQLite-backed
+// catalog) into the plugin.Catalog that codegen consumes to emit models
+// and enums. It reads the namespace / class / attribute / type tables
+// directly. Projection is best-effort: an unexpected query error against
+// the in-memory catalog yields a partial catalog rather than aborting
+// generation.
+func pluginCatalogFromCore(cc *core.Catalog) *plugin.Catalog {
+	db := cc.DB()
+	var schemas []*plugin.Schema
+
+	type row struct {
+		oid  int64
+		name string
+	}
+	readRows := func(query string, args ...any) []row {
+		rows, err := db.Query(query, args...)
+		if err != nil {
+			return nil
+		}
+		defer rows.Close()
+		var out []row
+		for rows.Next() {
+			var r row
+			if err := rows.Scan(&r.oid, &r.name); err != nil {
+				return out
+			}
+			out = append(out, r)
+		}
+		return out
+	}
+
+	for _, ns := range readRows(`SELECT oid, name FROM sql_namespace ORDER BY oid`) {
+		var tables []*plugin.Table
+		for _, cl := range readRows(
+			`SELECT oid, name FROM sql_class WHERE namespace_oid = ? AND kind = 'r' ORDER BY oid`, ns.oid,
+		) {
+			rel := &plugin.Identifier{Schema: ns.name, Name: cl.name}
+			var columns []*plugin.Column
+			crows, err := db.Query(
+				`SELECT a.name, t.name, a.not_null
+				 FROM sql_attribute a JOIN sql_type t ON t.oid = a.type_oid
+				 WHERE a.class_oid = ? ORDER BY a.num`, cl.oid,
+			)
+			if err != nil {
+				continue
+			}
+			for crows.Next() {
+				var name, typeName string
+				var notNull int
+				if err := crows.Scan(&name, &typeName, &notNull); err != nil {
+					break
+				}
+				columns = append(columns, &plugin.Column{
+					Name:    name,
+					Type:    &plugin.Identifier{Name: typeName},
+					NotNull: notNull != 0,
+					Table:   rel,
+				})
+			}
+			crows.Close()
+			tables = append(tables, &plugin.Table{Rel: rel, Columns: columns})
+		}
+		schemas = append(schemas, &plugin.Schema{Name: ns.name, Tables: tables})
+	}
+
+	return &plugin.Catalog{
+		DefaultSchema: "public",
+		Schemas:       schemas,
+	}
+}

internal/codegen/golang/clickhouse_type.go

@@ -0,0 +1,68 @@
+package golang
+
+import (
+	"strings"
+
+	"github.com/sqlc-dev/sqlc/internal/codegen/golang/opts"
+	"github.com/sqlc-dev/sqlc/internal/codegen/sdk"
+	"github.com/sqlc-dev/sqlc/internal/plugin"
+)
+
+// clickhouseType maps a ClickHouse column type to a Go type. Type names
+// arrive lower-cased from the core catalog (e.g. "uint64", "string",
+// "datetime"). Nullable columns (NotNull == false) map to a pointer, which
+// is how the clickhouse-go driver represents Nullable(T).
+func clickhouseType(req *plugin.GenerateRequest, options *opts.Options, col *plugin.Column) string {
+	dt := strings.ToLower(sdk.DataType(col.Type))
+	notNull := col.NotNull
+
+	switch dt {
+	case "uint8":
+		return nullable(notNull, "uint8")
+	case "uint16":
+		return nullable(notNull, "uint16")
+	case "uint32":
+		return nullable(notNull, "uint32")
+	case "uint64":
+		return nullable(notNull, "uint64")
+	case "int8":
+		return nullable(notNull, "int8")
+	case "int16":
+		return nullable(notNull, "int16")
+	case "int32":
+		return nullable(notNull, "int32")
+	case "int64":
+		return nullable(notNull, "int64")
+	case "uint128", "uint256", "int128", "int256":
+		// Big integers are represented as *big.Int by clickhouse-go.
+		return "*big.Int"
+	case "float32", "bfloat16":
+		return nullable(notNull, "float32")
+	case "float64":
+		return nullable(notNull, "float64")
+	case "bool":
+		return nullable(notNull, "bool")
+	case "string", "fixedstring":
+		return nullable(notNull, "string")
+	case "date", "date32", "datetime", "datetime64":
+		return nullable(notNull, "time.Time")
+
+	// The following resolve to string for now; richer mappings
+	// (decimal.Decimal, uuid.UUID, netip.Addr, json.RawMessage) require
+	// wiring their imports into the Go importer and are a follow-up.
+	case "decimal", "decimal32", "decimal64", "decimal128", "decimal256",
+		"uuid", "ipv4", "ipv6", "json", "enum8", "enum16":
+		return nullable(notNull, "string")
+
+	default:
+		return "interface{}"
+	}
+}
+
+// nullable wraps a base Go type in a pointer when the column is nullable.
+func nullable(notNull bool, base string) string {
+	if notNull {
+		return base
+	}
+	return "*" + base
+}

internal/codegen/golang/go_type.go

@@ -86,6 +86,8 @@ func goInnerType(req *plugin.GenerateRequest, options *opts.Options, col *plugin
 		return postgresType(req, options, col)
 	case "sqlite":
 		return sqliteType(req, options, col)
+	case "clickhouse":
+		return clickhouseType(req, options, col)
 	default:
 		return "interface{}"
 	}

internal/compiler/compile.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/sqlc-dev/sqlc/internal/engine/clickhouse"
 	"github.com/sqlc-dev/sqlc/internal/migrations"
 	"github.com/sqlc-dev/sqlc/internal/multierr"
 	"github.com/sqlc-dev/sqlc/internal/opts"
@@ -55,6 +56,18 @@ func (c *Compiler) parseCatalog(schemas []string) error {
 			continue
 		}
 
+		// ClickHouse populates the core catalog instead of the in-memory
+		// sql/catalog.
+		if c.coreCatalog != nil {
+			for i := range stmts {
+				if err := clickhouse.Apply(c.coreCatalog, stmts[i].Raw); err != nil {
+					merr.Add(filename, contents, stmts[i].Pos(), err)
+					continue
+				}
+			}
+			continue
+		}
+
 		for i := range stmts {
 			if err := c.catalog.Update(stmts[i], c); err != nil {
 				merr.Add(filename, contents, stmts[i].Pos(), err)
@@ -135,7 +148,8 @@ func (c *Compiler) parseQueries(o opts.Parser) (*Result, error) {
 	}
 
 	return &Result{
-		Catalog: c.catalog,
-		Queries: q,
+		Catalog:     c.catalog,
+		CoreCatalog: c.coreCatalog,
+		Queries:     q,
 	}, nil
 }